drm fixes for v5.8-rc3

core:
- fix VT registration regression

ttm:
- fix two fence leaks

amdgpu:
- Fix missed mutex unlock in DC error path
- Fix firmware leak for sdma5
- DC bpc property fixes

amdkfd:
- Fix memleak in an error path

radeon:
- Fix copy paste typo in NI DPM spll validation

rcar-du:
- build fix

tegra:
- add missing zpos property
- child driver registeration fix
- debugfs cleanup fix
- doc fix

mcde:
- reorder fbdev setup

panel:
- fix connector type
- fix orienation for some panels

sun4i:
- fix dma/iommu configuration

uvesafb:
- respect blank flag
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