staging: alarm-dev: Set the license to GPL

Adding "GPL" license to fix a warning while compiling as
module.

CC: Brian Swetland <swetland@google.com>
Signed-off-by: Pramod Gurav <pramod.gurav.etc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/android/alarm-dev.c b/drivers/staging/android/alarm-dev.c
index f200e8a..ff4b3e8 100644
--- a/drivers/staging/android/alarm-dev.c
+++ b/drivers/staging/android/alarm-dev.c
@@ -443,4 +443,4 @@
 
 module_init(alarm_dev_init);
 module_exit(alarm_dev_exit);
-
+MODULE_LICENSE("GPL");