ide/arm/ide_arm.c: add MODULE_LICENSE

Now that it can be built modular it needs a MODULE_LICENSE.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/arm/ide_arm.c b/drivers/ide/arm/ide_arm.c
index 43a70e9..be9ff73 100644
--- a/drivers/ide/arm/ide_arm.c
+++ b/drivers/ide/arm/ide_arm.c
@@ -46,3 +46,5 @@
 }
 
 module_init(ide_arm_init);
+
+MODULE_LICENSE("GPL");