[ARM] 4590/1: ns9xxx: add gpio handling functions

This implementation conforms to the general GPIO API
introduced in 2.6.21.

This patch was signed-of by David Brownell before I exported the functions
using EXPORT_SYMBOL.

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 691aae3..6acc59d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -318,6 +318,7 @@
 
 config ARCH_NS9XXX
 	bool "NetSilicon NS9xxx"
+	select GENERIC_GPIO
 	help
 	  Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 	  System.