drm/amdgpu/pm: notify driver unloading to PMFW for SMU v13.0.6 dGPU

Per requested, follow the same sequence as APU to send only
PPSMC_MSG_PrepareForDriverUnload to PMFW during driver unloading.
Signed-off-by: Le Ma <le.ma@amd.com>
Reviewed-by: Shiwu Zhang <shiwu.zhang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@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_6_ppt.c

@@ -1413,18 +1413,16 @@ static int smu_v13_0_6_system_features_control(struct smu_context *smu,
 					       bool enable)
 {
 	struct amdgpu_device *adev = smu->adev;
-	int ret;
-
-	/* On APUs, notify FW that the device is no longer driver managed */
-	if (adev->flags & AMD_IS_APU) {
-		if (!enable)
-			smu_v13_0_6_notify_unload(smu);
+	int ret = 0;
 
-		return 0;
+	if (enable) {
+		if (!(adev->flags & AMD_IS_APU))
+			ret = smu_v13_0_system_features_control(smu, enable);
+	} else {
+		/* Notify FW that the device is no longer driver managed */
+		smu_v13_0_6_notify_unload(smu);
 	}
 
-	ret = smu_v13_0_system_features_control(smu, enable);
-
 	return ret;
 }