drm/amd/amdgpu: S3 resumed failed after 4-5 times loop

Phenomenon: software hang when device resume back, read UVD fence is 0xffffffff
and read pcie pid is 0xffff.
The issue is caused by VCE reset when update cg setting. according to HW programming
guide, adjust update VCE cg sequence.
The patch apply to VCE2.0.

Signed-off-by: JimQu <Jim.Qu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>