Port functionality from the Radeon driver to support
UVD clock control.
Signed-off-by: NAlex Jivin <alex.jivin@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>