drm fixes for 5.13-rc1

two MAINTAINERS updates.

amdgpu:
- Fixes for flexible array conversions
- Fix sysfs attribute init
- Harvesting fixes
- VCN CG/PG fixes for Picasso

radeon:
- Fixes for flexible array conversions
- Fix for flickering on Oland with multiple 4K displays

vc4:
- drop an used function
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