ide/ppc/mpc8xx.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>

drivers/ide/ppc/mpc8xx.c

@@ -853,3 +853,5 @@ static int __init mpc8xx_ide_probe(void)
 }
 
 module_init(mpc8xx_ide_probe);
+
+MODULE_LICENSE("GPL");