drm fixes for 5.6-rc5

dma-buf:
- fix memory leak

core:
- shmem object mmap fix.

ttm:
- Fix fence leak in ttm_buffer_object_transfer().

amdgpu:
- Gfx reset fix for gfx9, 10
- Fix for gfx10
- DP MST fix
- DCC fix
- Renoir power fixes
- Navi power fix

i915:
- Break up long lists of object reclaim with cond_resched()
- PSR probe fix
- TGL workarounds
- Selftest return value fix
- Drop timeline mutex while waiting for retirement
- Wait for OA configuration completion before writes to OA buffer

virtio:
- Fix resource id creation race in virtio.
- mmap fixes

sun4i:
- Fixes for sun4i VI layer format support.

kirin:
- kirin: Revert "Fix for hikey620 display offset problem"

exynos:
- fix a kernel oops problem in case that driver is loaded as module.
- fix a regulator warning issue when I2C DDC adapter cannot be gathered.
- print out an error message only in error case excepting -EPROBE_DEFER.

mediatek:
- overlay, cursor and gce fixes.
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