drm fixes for 5.10-rc1

i915:
- Set all unused color plane offsets to ~0xfff again (Ville)
- Fix TGL DKL PHY DP vswing handling (Ville)

amdgpu:
- DCN clang warning fix
- eDP fix
- BACO fix
- Kernel documentation fixes
- SMU7 mclk fix
- VCN1 hw bug workaround

amdkfd:
- kvfree vs kfree fix
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