drm/amd/amdgpu: Partially revert change to UVD v3 CG

Partially undo changes made by commit:

drm/amd/amdgpu: don't track state in UVD clockgating

To keep bypass even if CG flags are not set.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>