mfd/pcf50633-gpio.c: add MODULE_LICENSE

Add the missing MODULE_LICENSE("GPL").

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/pcf50633-gpio.c

@@ -15,6 +15,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/module.h>
 
 #include <linux/mfd/pcf50633/core.h>
 #include <linux/mfd/pcf50633/gpio.h>
@@ -116,3 +117,5 @@ int pcf50633_gpio_power_supply_set(struct pcf50633 *pcf,
 	return pcf50633_reg_set_bit_mask(pcf, reg, mask, val);
 }
 EXPORT_SYMBOL_GPL(pcf50633_gpio_power_supply_set);
+
+MODULE_LICENSE("GPL");