[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/devices.c b/arch/arm/mach-pxa/devices.c
index 35736fc..541940b 100644
--- a/arch/arm/mach-pxa/devices.c
+++ b/arch/arm/mach-pxa/devices.c
@@ -4,7 +4,7 @@
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 
-#include <mach/gpio.h>
+#include <mach/pxa-regs.h>
 #include <mach/udc.h>
 #include <mach/pxafb.h>
 #include <mach/mmc.h>