docs: add release notes for 20.2.5

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+Mesa 20.2.5 Release Notes / 2020-12-16
+======================================
+
+Mesa 20.2.5 is a bug fix release which fixes bugs found since the 20.2.4 release.
+
+Mesa 20.2.5 implements the OpenGL 4.6 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 4.6. OpenGL
+4.6 is **only** available if requested at context creation.
+Compatibility contexts may report a lower version depending on each driver.
+
+Mesa 20.2.5 implements the Vulkan 1.2 API, but the version reported by
+the apiVersion property of the VkPhysicalDeviceProperties struct
+depends on the particular driver being used.
+
+SHA256 checksum
+---------------
+
+::
+
+    TBD.
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- Mesa 20.3.0 and older ATi/Radeon cards fails
+- Amber test NIR validation failed after spirv_to_nir
+- Amber test validate_phi_src
+- [RADV] broken stencil behaviour when using extended dynamic stencil state
+- [RADV] Some bindings seem broken with VK_DYNAMIC_STATE_VERTEX_INPUT_BINDING_STRIDE_EXT
+- ci: Missing needs: in radeonsi-stoney-*?
+- Triangles appear from the center of the field on PES2021 with Mesa 20.2.x
+- [gen9][iris][regression][bisected] flaky piglit tests
+- [Intel][OpenGL] Fail to get correct value when sampling from a texture in depth formats.
+- Storing pointer to temporary value inside the Iris driver.
+
+
+Changes
+-------
+
+Andrii Simiklit (1):
+
+- iris: update depth value for stages after fast clear depth
+
+Bas Nieuwenhuizen (5):
+
+- radv: Fix a hang on CB change by adding flushes.
+- radv: Deal with unused attachments in mip flush
+- radv: Skip tiny non-visible VRAM heap.
+- radv: Fix budget calculations with large BAR.
+- radv: Fix exporting/importing multisample images.
+
+Boris Brezillon (1):
+
+- panfrost: Make sure we always add a reader -> write dependency when needed
+
+Daniel Schürmann (2):
+
+- aco/ra: use get_reg_specified() for p_extract_vector
+- aco: fix DCE of rematerializable phi operands
+
+Danylo Piliaiev (1):
+
+- nir/lower_returns: Append missing phis' sources after "break" insertion
+
+Dave Airlie (1):
+
+- radeonsi: fix regression on gpus using the radeon winsys.
+
+Dylan Baker (8):
+
+- relnotes: Add sha256sums for 20.2.4
+- .pick_status.json: Update to ec3828add38a83b8c09fd5896265abc9d766162e
+- .pick_status.json: Update to f93b7d14d66d8ba70d44772d1a1b6696310b7d17
+- .pick_status.json: Update to 3f0da800eb4b8184c24707c52d5a519abe948898
+- .pick_status.json: Update to cf3fc79cd0ab55776bbbabe76237c272ab07133e
+- .pick_status.json: Update to 84c8a35aa2ca4d4de66192933735094ed07b4aaa
+- .pick_status.json: Update to a7fb3954a1318a6b27e1405a9e799dd8f06eaa34
+- .pick_status.json: Update to ada9be1ec9e14fc045086411fbf2d3cb0efbbe2f
+
+Eric Anholt (1):
+
+- softpipe: Fix swizzled texture gather of int textures.
+
+Erik Faye-Lund (1):
+
+- gallium: do not reset buffers for unsupported stages
+
+Jonathan Gray (1):
+
+- aco: use UINT64_C on 64 bit constant arguments
+
+Marcin Ślusarz (1):
+
+- iris: store copy of the border color in the border color hash table
+
+Marek Olšák (4):
+
+- radeonsi: determine correctly if switching from normal launch to fast launch
+- ac: fix detection of Pro graphics
+- ac: fix min/max_good_num_cu_per_sa on gfx10.3 with disabled SEs
+- radeonsi: disable SDMA on gfx6-7 and gfx10.3 to decrease CPU overhead
+
+Mauro Rossi (1):
+
+- android: spirv: fix '::' typo in gen rules
+
+Michel Dänzer (2):
+
+- ci: .lava-test:amd64 template needs arm_build
+- ac: Don't negate strstr return values in ac_query_gpu_info
+
+Mike Blumenkrantz (3):
+
+- zink: fix direct image mapping offset
+- zink: really fix direct image mapping offset (I mean it this time)
+- st/pbo: fix pbo uploads without PIPE_CAP_TGSI_VS_LAYER_VIEWPORT
+
+Nanley Chery (1):
+
+- iris: Fix resource ptr in resolve_sampler_views
+
+Rhys Perry (2):
+
+- aco: don't assume src=lower when splitting self-intersecting copies
+- spirv: fix GLSLstd450Modf/GLSLstd450Frexp when the destination is vector
+
+Robin Ole Heinemann (1):
+
+- anv: Add DRM_RDWR flag in anv_gem_handle_to_fd
+
+Samuel Pitoiset (11):
+
+- radv: mark GFX10.3 as a non-conformant Vulkan implementation
+- radv: fix exporting multiviews with NGG
+- radv: disable alphaToOne feature
+- radv: fix ignoring the vertex attribute stride if set as dynamic
+- radv: fix optimizing needed states if some are marked as dynamic
+- radv: do VGT_FLUSH when switching NGG -> legacy on Sienna Cichlid
+- radv: fix applying the NGG minimum vertex count requirement
+- radv: don't count unusable vertices to the NGG LDS size
+- aco: fix combining max(-min(a, b), c) if a or b uses the neg modifier
+- radv: ignore other blend targets if dual-source blending is enabled
+- radv: disable SQTT support for unsupported GPUs
+
+Simon Ser (1):
+
+- radv: fix access to uninitialized radeon_bo_metadata
+
+Tapani Pälli (1):
+
+- anv: fix calculation of buffer size in case dynamic size is used
+
+Timur Kristóf (1):
+
+- aco: Use program->num_waves as maximum in scheduler.
+
+Vinson Lee (1):
+
+- meson: Fix Clang microsoft-enum-value detection.
+
+Witold Baryluk (1):
+
+- zink: Cap PIPE_SHADER_CAP_MAX_CONST_BUFFERS to 32
+
+cheyang (1):
+
+- android: fix build failure with libbacktrace
+
+yshi18 (1):
+
+- iris: fix memleak for query_buffer_uploader