drm/amdgpu: fix pm_load_smu_firmware for SR-IOV

For SR-IOV VF, powerplay may not be supported, in this case,
error '-EINVAL' should not be returned.
Signed-off-by: Trigger Huang <Trigger.Huang@amd.com>
Reviewed-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2702,6 +2702,9 @@ int amdgpu_pm_load_smu_firmware(struct amdgpu_device *adev, uint32_t *smu_versio
 {
 	int r = -EINVAL;
 
+	if (amdgpu_sriov_vf(adev))
+		return 0;
+
 	if (adev->powerplay.pp_funcs && adev->powerplay.pp_funcs->load_firmware) {
 		r = adev->powerplay.pp_funcs->load_firmware(adev->powerplay.pp_handle);
 		if (r) {