x86: gpio: Add GPIO driver for Intel ICH6 and later.

Implement <asm-generic/gpio.h> functions for Intel ICH6 and later.
Only GPIOs 0-31 are handled by this code.

Signed-off-by: Bill Richardson <wfrichar@chromium.org>

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d50ac3b..2d97b4f 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -26,6 +26,7 @@
 LIB 	:= $(obj)libgpio.o
 
 COBJS-$(CONFIG_AT91_GPIO)	+= at91_gpio.o
+COBJS-$(CONFIG_INTEL_ICH6_GPIO)	+= intel_ich6_gpio.o
 COBJS-$(CONFIG_KIRKWOOD_GPIO)	+= kw_gpio.o
 COBJS-$(CONFIG_MARVELL_GPIO)	+= mvgpio.o
 COBJS-$(CONFIG_MARVELL_MFP)	+= mvmfp.o