drm/amd/pm: enable GFX ULV feature support for SMU13.0.0

The feature is ready with latest firmwares.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c

@@ -313,6 +313,9 @@ smu_v13_0_0_get_allowed_feature_mask(struct smu_context *smu,
 
 	*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_DPM_GFX_POWER_OPTIMIZER_BIT);
 
+	if (adev->pm.pp_feature & PP_ULV_MASK)
+		*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_GFX_ULV_BIT);
+
 	return 0;
 }