USB: add missing KERN_* constants to printks

According to kerneljanitors todo list all printk calls (beginning
a new line) should have an according KERN_* constant.
Those are the missing peaces here for the usb subsystem.

Signed-off-by: Frank Seidel <frank@f-seidel.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
index d8d9a52..9d7b95d 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_usb2_udc.c
@@ -1802,7 +1802,8 @@
 
 out:
 	if (retval)
-		printk("gadget driver register failed %d\n", retval);
+		printk(KERN_WARNING "gadget driver register failed %d\n",
+		       retval);
 	return retval;
 }
 EXPORT_SYMBOL(usb_gadget_register_driver);
@@ -1847,7 +1848,8 @@
 	udc_controller->gadget.dev.driver = NULL;
 	udc_controller->driver = NULL;
 
-	printk("unregistered gadget driver '%s'\n", driver->driver.name);
+	printk(KERN_WARNING "unregistered gadget driver '%s'\n",
+	       driver->driver.name);
 	return 0;
 }
 EXPORT_SYMBOL(usb_gadget_unregister_driver);
@@ -2455,7 +2457,7 @@
 static void __exit udc_exit(void)
 {
 	platform_driver_unregister(&udc_driver);
-	printk("%s unregistered\n", driver_desc);
+	printk(KERN_WARNING "%s unregistered\n", driver_desc);
 }
 
 module_exit(udc_exit);