USB: convert drivers/input/* to use module_usb_driver()

This converts the drivers in drivers/input/* to use the
module_usb_driver() macro which makes the code smaller and a bit
simpler.

Added bonus is that it removes some unneeded kernel log messages about
drivers loading and/or unloading.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Ville Syrjala <syrjala@sci.fi>
Cc: Henk Vergonet <Henk.Vergonet@gmail.com>
Cc: Alessandro Rubini <rubini@ipvvis.unipv.it>
Cc: Henrik Rydberg <rydberg@euromail.se>
Cc: "Magnus Hörlin" <magnus@alefors.se>
Cc: Chris Moeller <kode54@gmail.c>
Cc: Christoph Fritz <chf.fritz@googlemail.com>
Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Edwin van Vliet <edwin@cheatah.nl>
Cc: Ping Cheng <pingc@wacom.com>
Cc: Eduard Hasenleithner <eduard@hasenleithner.at>
Cc: Alexander Strakh <strakh@ispras.ru>
Cc: Glenn Sommer <gsommer@datanordisk.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c
index 290f4e5..85a5b40 100644
--- a/drivers/input/tablet/kbtab.c
+++ b/drivers/input/tablet/kbtab.c
@@ -198,22 +198,4 @@
 	.id_table =	kbtab_ids,
 };
 
-static int __init kbtab_init(void)
-{
-	int retval;
-	retval = usb_register(&kbtab_driver);
-	if (retval)
-		goto out;
-	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
-	       DRIVER_DESC "\n");
-out:
-	return retval;
-}
-
-static void __exit kbtab_exit(void)
-{
-	usb_deregister(&kbtab_driver);
-}
-
-module_init(kbtab_init);
-module_exit(kbtab_exit);
+module_usb_driver(kbtab_driver);