ar71xx: fix 2.6.34 build errors

SVN-Revision: 21698

target/linux/ar71xx/files/arch/mips/ar71xx/dev-gpio-buttons.c

@@ -10,6 +10,7 @@
  */
 
 #include "linux/init.h"
+#include "linux/slab.h"
 #include <linux/platform_device.h>
 
 #include "dev-gpio-buttons.h"

target/linux/ar71xx/files/arch/mips/ar71xx/dev-leds-gpio.c

@@ -12,6 +12,7 @@
  */
 
 #include <linux/init.h>
+#include <linux/slab.h>
 #include <linux/platform_device.h>
 
 #include "dev-leds-gpio.h"

target/linux/ar71xx/files/drivers/gpio/nxp_74hc153.c

@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/gpio.h>
+#include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/nxp_74hc153.h>