Due to raven/raven2 maybe enable  sclk slow down,
they cannot get clock count by the RLC at the auto level of dpm performance.
So switch to golden tsc register.
Suggested-by: shanshengwang <shansheng.wang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Jesse Zhang <jesse.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>