[ARM] pxa: use <linux/gpio.h> instead of unnecessary <mach/gpio.h>

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/mach-pxa/littleton.c b/arch/arm/mach-pxa/littleton.c
index b4d00ab..5609f52 100644
--- a/arch/arm/mach-pxa/littleton.c
+++ b/arch/arm/mach-pxa/littleton.c
@@ -20,6 +20,7 @@
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/smc91x.h>
 
@@ -36,7 +37,6 @@
 
 #include <mach/pxa-regs.h>
 #include <mach/mfp-pxa300.h>
-#include <mach/gpio.h>
 #include <mach/pxafb.h>
 #include <mach/ssp.h>
 #include <mach/pxa2xx_spi.h>