drm fixes for v5.7-rc7

vmwgfx:
- change maintainers
- fix redundant assignment
- fix parameter name
- fix return value

etnaviv:
- memory leak fix when userspace passes a invalid softpin address
- off-by-one crashing the kernel in the perfmon domain iteration when
  the GPU core has both 2D and 3D capabilities

amdgpu:
- DP fix
- Floating point fix
- Fix cursor stutter issue
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