drm/amd/amdgpu: Update RLC_SPM_MC_CNT by ring wreg in guest

Submit command of wreg in GFX and COMPUTE ring to update
RLC_SPM_MC_CNT in guest machine during runtime.

Signed-off-by: YuanShang <YuanShang.Mao@amd.com>
Reviewed-by: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>