ARM: SAMSUNG: Fix on inclusion mach/gpio.h for Samsung SoCs

This patch fixes on inclusion <mach/gpio.h> to <linux/gpio.h>

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/mach-s3c64xx/dev-spi.c b/arch/arm/mach-s3c64xx/dev-spi.c
index 29c32d0..a492b98 100644
--- a/arch/arm/mach-s3c64xx/dev-spi.c
+++ b/arch/arm/mach-s3c64xx/dev-spi.c
@@ -12,10 +12,10 @@
 #include <linux/string.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
+#include <linux/gpio.h>
 
 #include <mach/dma.h>
 #include <mach/map.h>
-#include <mach/gpio.h>
 #include <mach/gpio-bank-c.h>
 #include <mach/spi-clocks.h>