usb: dwc3: omap: move to module_platform_driver

the new module_platform_driver macro is a helper
for modules which just register and unregister the
platform_driver. It allows us to delete a few
duplicated lines.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/dwc3-omap.c

@@ -399,14 +399,4 @@ MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("DesignWare USB3 OMAP Glue Layer");
 
-static int __devinit dwc3_omap_init(void)
-{
-	return platform_driver_register(&dwc3_omap_driver);
-}
-module_init(dwc3_omap_init);
-
-static void __exit dwc3_omap_exit(void)
-{
-	platform_driver_unregister(&dwc3_omap_driver);
-}
-module_exit(dwc3_omap_exit);
+module_platform_driver(dwc3_omap_driver);