drm/amd/powerplay: refine phm_register_thermal_interrupt interface

currently, not all asics implement this callback function
so not return error to avoid powerplay initialize failed
in those asices
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/hardwaremanager.c

@@ -210,10 +210,10 @@ int phm_register_thermal_interrupt(struct pp_hwmgr *hwmgr, const void *info)
 {
 	PHM_FUNC_CHECK(hwmgr);
 
-	if (hwmgr->hwmgr_func->register_internal_thermal_interrupt == NULL)
-		return -EINVAL;
+	if (hwmgr->hwmgr_func->register_internal_thermal_interrupt != NULL)
+		return hwmgr->hwmgr_func->register_internal_thermal_interrupt(hwmgr, info);
 
-	return hwmgr->hwmgr_func->register_internal_thermal_interrupt(hwmgr, info);
+	return 0;
 }
 
 /**