drm/amd/powerplay: enable Fan control for sienna_cichlid

Support for Advanced Fan Control (AFC+) for sienna_cichlid.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/sienna_cichlid_ppt.c

@@ -279,6 +279,7 @@ sienna_cichlid_get_allowed_feature_mask(struct smu_context *smu,
 				| FEATURE_MASK(FEATURE_FW_DSTATE_BIT)
 				| FEATURE_MASK(FEATURE_DF_CSTATE_BIT)
 				| FEATURE_MASK(FEATURE_GFX_SS_BIT)
+				| FEATURE_MASK(FEATURE_FAN_CONTROL_BIT)
 				| FEATURE_MASK(FEATURE_THERMAL_BIT);
 
 	if (adev->pm.pp_feature & PP_SCLK_DPM_MASK)