ide/legacy/gayle.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/legacy/gayle.c b/drivers/ide/legacy/gayle.c
index b7d81090..e3b4638 100644
--- a/drivers/ide/legacy/gayle.c
+++ b/drivers/ide/legacy/gayle.c
@@ -195,3 +195,5 @@
 }
 
 module_init(gayle_init);
+
+MODULE_LICENSE("GPL");