[ARM] 4961/1: gpiolib support for SA-1100 architecture

This adds gpiolib support for the SA-1100 arch:
 - Move all GPIO API functions from generic.c into gpio.c
 - Convert all gpio functions into gpiolib callbacks.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4039a13..1f7c728 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -426,6 +426,7 @@
 	select GENERIC_GPIO
 	select GENERIC_TIME
 	select HAVE_IDE
+	select HAVE_GPIO_LIB
 	help
 	  Support for StrongARM 11x0 based boards.