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>
diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
index e2f9dcf..2dadc31 100644
--- a/drivers/regulator/pfuze100-regulator.c
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -451,4 +451,5 @@
 
 MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
 MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
+MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("pfuze100-regulator");