drm fixes for 6.2-rc6

drm:
- DP MST kref fix
- fb_helper: check return value

i915:
- Fix BSC default context for Meteor Lake
- Fix selftest-scheduler's modify_type
- memory leak fix

amdgpu:
- GC11.x fixes
- SMU13.0.0 fix
- Freesync video fix
- DP MST fixes
- build fix
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