backlight: convert drivers/video/backlight/* to use module_platform_driver()

Convert the drivers in drivers/video/backlight/* to use the
module_platform_driver() macro which makes the code smaller and a bit
simpler.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>	[ep93xx_bl.c]
Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/backlight/omap1_bl.c b/drivers/video/backlight/omap1_bl.c
index 08d26a7..d8cde27 100644
--- a/drivers/video/backlight/omap1_bl.c
+++ b/drivers/video/backlight/omap1_bl.c
@@ -195,18 +195,7 @@
 	},
 };
 
-static int __init omapbl_init(void)
-{
-	return platform_driver_register(&omapbl_driver);
-}
-
-static void __exit omapbl_exit(void)
-{
-	platform_driver_unregister(&omapbl_driver);
-}
-
-module_init(omapbl_init);
-module_exit(omapbl_exit);
+module_platform_driver(omapbl_driver);
 
 MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>");
 MODULE_DESCRIPTION("OMAP LCD Backlight driver");