drm fixes for 5.19-rc8

scheduler:
- scheduling while atomic fix

ttm:
- locking fix

edp:
- variable typo fix

i915:
- add back support for v69 firmware on ADL-P.

amdgpu:
- Drop redundant buffer cleanup that can lead to a segfault
- Add a bo_list mutex to avoid possible list corruption in CS
- dmub notification fix

imx:
- fix error path
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