qmi_rmnet: Make powersave workqueue unbound and freezable

* After commit "Revert "dfc: Use alarm timer to trigger powersave work",
this workqueue is now is use for qmi_rmnet_check_stats. Make it unbound
and freezable to save power.

Signed-off-by: LibXZR <xzr467706992@163.com>

drivers/soc/qcom/qmi_rmnet.c

@@ -1234,8 +1234,7 @@ void qmi_rmnet_work_init(void *port)
 	if (rmnet_ps_wq)
 		return;
 
-	rmnet_ps_wq = alloc_workqueue("rmnet_powersave_work",
-				      WQ_CPU_INTENSIVE, 1);
+	rmnet_ps_wq = create_freezable_workqueue("rmnet_powersave_work");
 
 	if (!rmnet_ps_wq)
 		return;