docs: add release notes for 20.2.1

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+Mesa 20.2.1 Release Notes / 2020-10-14
+======================================
+
+Mesa 20.2.1 is a bug fix release which fixes bugs found since the 20.2.0 release.
+
+Mesa 20.2.1 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 20.2.1 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
+---------
+
+- RADV ACO - ground line corruption in Path of Exile with Vulkan renderer
+- Graphics corruption in Super Mega Baseball 2 with RADV on Navi
+- Running Amber test leads to VK_DEVICE_LOST
+- omx/tizonia build broken with latest mesa git
+- [hsw][bisected][regression] gpu hangs on dEQP-VK.subgroups.(shuffle|quad) tests
+- TGL B0 Stepping gpu hangs on many dEQP-VK.subgroups.quad nonconst tests
+- [spirv-fuzz] Shader generates a wrong image
+
+
+Changes
+-------
+
+Alyssa Rosenzweig (2):
+
+- pan/bi: Handle vector moves
+- pan/bi: Fix simple txl test
+
+Anuj Phogat (1):
+
+- intel/gen9: Enable MSC RAW Hazard Avoidance
+
+Bas Nieuwenhuizen (3):
+
+- radv,radeonsi: Disable compression on interop depth images
+- radv: Use atomics to read query results.
+- radv: Fix mipmap extent adjustment on GFX9+.
+
+Christian Gmeiner (1):
+
+- etnaviv: simplify linear stride implementation
+
+Connor Abbott (1):
+
+- nir/lower_io_arrays: Fix xfb_offset bug
+
+Danylo Piliaiev (1):
+
+- intel/fs: Disable sample mask predication for scratch stores
+
+Dylan Baker (12):
+
+- docs: add release notes for 20.2.0
+- docs: Add sh256 sums for 20.2.0
+- .pick_status.json: Update to 291cfb1e41513008a5be08be95399373a7de206d
+- meson/anv: Use variable that checks for --build-id
+- .pick_status.json: Update to 7dbb1f7462433940951ce6c3fa22f6368aeafd50
+- .pick_status.json: Update to e3b814d5e9e414839d5e4de3a76bb2899cbb7249
+- .pick_status.json: Update to b32a8f83dce3b8789f2e8790ab41b8a63c9bedc6
+- .pick_status.json: Mark b23013db0aa6845d661c2da5d4003615b064e01f as denominated
+- .pick_status.json: Mark 4790811d78011d45830d9543ad6e7401391cfb15 as denominated
+- glsl/xxd.py: fix imports
+- .pick_status.json: Update to e1efc534e6c452e3e606d663864896a654acc185
+- retab ac_surface.h so that backports apply
+
+Eric Engestrom (1):
+
+- radv: add missing u_atomic.h include
+
+Erik Faye-Lund (1):
+
+- st/mesa: use roundf instead of floorf for lod-bias rounding
+
+Jason Ekstrand (6):
+
+- nir/liveness: Consider if uses in nir_ssa_defs_interfere
+- nir/cf: Better handle intra-block splits
+- intel/fs: NoMask initialize the address register for shuffles
+- nir/opt_load_store_vectorize: Use bit sizes when checking mask compatibility
+- intel/fs: Don't use NoDDClk/NoDDClr for split SHUFFLEs
+- intel/nir: Don't try to emit vector load_scratch instructions
+
+Jose Maria Casanova Crespo (3):
+
+- vc4: Avoid negative scissor caused by no intersection
+- nir/algebraic: optimize iand/ior of (n)eq zero when umax/umin not available
+- vc4: Enable lower_umax and lower_umin
+
+Lionel Landwerlin (1):
+
+- intel/perf: fix crash when no perf queries are supported
+
+Lucas Stach (1):
+
+- etnaviv: stop leaking the dummy texure descriptor BO
+
+Marek Olšák (4):
+
+- radeonsi: fix indirect dispatches with variable block sizes
+- radeonsi: Fix dead lock with aux_context_lock in si_screen_clear_buffer.
+- gallium/u_threaded_context: fix use-after-free in transfer_unmap
+- ac/surface: fix valgrind warnings in DCC retile tile lookups
+
+Nanley Chery (3):
+
+- blorp: Ensure aligned HIZ_CCS_WT partial clears
+- iris: Fix a fast-clear skipping optimization
+- anv: Enable multi-layer aux-map init for HIZ+CCS
+
+Philipp Zabel (1):
+
+- meson: fix power8 option
+
+Pierre-Eric Pelloux-Prayer (3):
+
+- gallium/vl: do not call transfer_unmap if transfer is NULL
+- gallium/vl: add chroma_format arg to vl_video_buffer functions
+- omx/tizonia: fix build
+
+Rhys Perry (4):
+
+- spirv: add and use a generator id enum
+- android: fix SPIR-V -> NIR build
+- scons: fix SPIR-V -> NIR build
+- spirv: replace discard with demote for incorrect HLSL->SPIR-V translations
+
+Samuel Pitoiset (1):
+
+- aco: implement missing nir_op_unpack_half_2x16_split_{x,y}_flush_to_zero
+
+Timothy Arceri (1):
+
+- glsl: don't duplicate state vars as uniforms in the NIR linker
+
+Vinson Lee (2):
+
+- gallium/dri2: Move image->texture assignment after image NULL check.
+- freedreno: Move rsc NULL check to before rsc dereferences.