Mainly adding the WAFL spread spectrum info, for adjusting display
clocks when XGMI is enabled.
Signed-off-by: NLeo Li <sunpeng.li@amd.com>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>