[media] convert drivers/media/* to use module_platform_driver()

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

Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: "Richard Röjfors" <richard.rojfors@pelagicore.com>
Cc: "Matti J. Aaltonen" <matti.j.aaltonen@nokia.com>
Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Manjunath Hadli <manjunath.hadli@ti.com>
Cc: Muralidharan Karicheri <m-karicheri2@ti.com>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Daniel Drake <dsd@laptop.org>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Matti J. Aaltonen <matti.j.aaltonen@nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c
index ba00474..0cb461d 100644
--- a/drivers/media/video/mx3_camera.c
+++ b/drivers/media/video/mx3_camera.c
@@ -1286,19 +1286,7 @@
 	.remove		= __devexit_p(mx3_camera_remove),
 };
 
-
-static int __init mx3_camera_init(void)
-{
-	return platform_driver_register(&mx3_camera_driver);
-}
-
-static void __exit mx3_camera_exit(void)
-{
-	platform_driver_unregister(&mx3_camera_driver);
-}
-
-module_init(mx3_camera_init);
-module_exit(mx3_camera_exit);
+module_platform_driver(mx3_camera_driver);
 
 MODULE_DESCRIPTION("i.MX3x SoC Camera Host driver");
 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");