regulator: pfuze100: add MODULE_LICENSE() in pfuze100 driver

Fix building error on x86_64 and i386:
WARNING: modpost: missing MODULE_LICENSE() in
drivers/regulator/pfuze100-regulator.o
Signed-off-by: Robin Gong <b38343@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/pfuze100-regulator.c

@@ -451,4 +451,5 @@ module_i2c_driver(pfuze_driver);
 
 MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
 MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
+MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("pfuze100-regulator");