gpio: reorganize drivers

Sort the gpio makefile and enforce the naming convention gpio-*.c for
gpio drivers.

v2: cleaned up filenames in Kconfig and comment blocks
v3: fixup use of BASIC_MMIO to GENERIC_GPIO for mxc

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/gpio-s5pc100.c b/drivers/gpio/gpio-s5pc100.c
index 2842394..7f87b0c 100644
--- a/drivers/gpio/gpio-s5pc100.c
+++ b/drivers/gpio/gpio-s5pc100.c
@@ -1,4 +1,5 @@
-/* linux/arch/arm/mach-s5pc100/gpiolib.c
+/*
+ * S5PC100 - GPIOlib support
  *
  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
@@ -6,8 +7,6 @@
  *  Copyright 2009 Samsung Electronics Co
  *  Kyungmin Park <kyungmin.park@samsung.com>
  *
- * S5PC100 - GPIOlib support
- *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.