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

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

Cc: James Hsiao <jhsiao@amcc.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Kim Phillips <kim.phillips@freescale.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Vladimir Zapolskiy <vzapolskiy@gmail.com>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c
index a2b553e..9b1571c 100644
--- a/drivers/crypto/picoxcell_crypto.c
+++ b/drivers/crypto/picoxcell_crypto.c
@@ -1854,17 +1854,7 @@
 	.id_table	= spacc_id_table,
 };
 
-static int __init spacc_init(void)
-{
-	return platform_driver_register(&spacc_driver);
-}
-module_init(spacc_init);
-
-static void __exit spacc_exit(void)
-{
-	platform_driver_unregister(&spacc_driver);
-}
-module_exit(spacc_exit);
+module_platform_driver(spacc_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Jamie Iles");