android-common: include linux/slab.h

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/android/timed_gpio.c

@@ -16,6 +16,7 @@
 
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 #include <linux/hrtimer.h>
 #include <linux/err.h>
 #include <linux/gpio.h>