mtd: convert drivers/mtd/* to use module_platform_driver()

This patch converts the drivers in drivers/mtd/* 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>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index b4f3cc9..45df542 100644
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -353,17 +353,7 @@
 	.remove		= __devexit_p(fun_remove),
 };
 
-static int __init fun_module_init(void)
-{
-	return platform_driver_register(&of_fun_driver);
-}
-module_init(fun_module_init);
-
-static void __exit fun_module_exit(void)
-{
-	platform_driver_unregister(&of_fun_driver);
-}
-module_exit(fun_module_exit);
+module_platform_driver(of_fun_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");