drm/amd/powerplay: don't check hwmgr while using the sw smu

While using the sw smu path, driver won't init hwmgr structure.
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

@@ -2443,7 +2443,7 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
 				"pp_power_profile_mode\n");
 		return ret;
 	}
-	if (hwmgr->od_enabled) {
+	if (is_support_sw_smu(adev) || hwmgr->od_enabled) {
 		ret = device_create_file(adev->dev,
 				&dev_attr_pp_od_clk_voltage);
 		if (ret) {