sw clockgate was used on uvd6.0.
when uvd is idle, we gate the uvd clock.
when decode, we ungate the uvd clock.
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>