drm/powerplay: Add smu set xgmi pstate interface
XGMI pstate is controlled by SMU, driver need this interface to communicate with SMU Signed-off-by: shaoyunl <shaoyun.liu@amd.com> Reviewed-by: Evan Quan <evan.quan@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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