mfd: Use module_pci_driver

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

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Andres Salomon <dilinger@queued.net>
Cc: Ira W. Snyder <iws@ovro.caltech.edu>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Denis Turischev <denis@compulab.co.il>
Cc: Harald Welte <HaraldWelte@viatech.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
index 315fef5..3419e72 100644
--- a/drivers/mfd/cs5535-mfd.c
+++ b/drivers/mfd/cs5535-mfd.c
@@ -186,18 +186,7 @@
 	.remove = __devexit_p(cs5535_mfd_remove),
 };
 
-static int __init cs5535_mfd_init(void)
-{
-	return pci_register_driver(&cs5535_mfd_driver);
-}
-
-static void __exit cs5535_mfd_exit(void)
-{
-	pci_unregister_driver(&cs5535_mfd_driver);
-}
-
-module_init(cs5535_mfd_init);
-module_exit(cs5535_mfd_exit);
+module_pci_driver(cs5535_mfd_driver);
 
 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");