regulator: rc5t583: Correct MODULE LICENSE to GPL v2

Fixing build issue reported by Paul Gortmaker:

It appears this breaks linux-next allmodconfig build, because it
uses an uppercase V in the v2 of its MODULE_LICENSE.

FATAL: modpost: GPL-incompatible module rc5t583-regulator.ko uses
GPL-only symbol 'platform_driver_unregister'
make[2]: *** [__modpost] Error 1

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/rc5t583-regulator.c b/drivers/regulator/rc5t583-regulator.c
index fcb9cc7..7e9c14a 100644
--- a/drivers/regulator/rc5t583-regulator.c
+++ b/drivers/regulator/rc5t583-regulator.c
@@ -347,4 +347,4 @@
 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_DESCRIPTION("RC5T583 regulator driver");
 MODULE_ALIAS("platform:rc5t583-regulator");
-MODULE_LICENSE("GPL V2");
+MODULE_LICENSE("GPL v2");