powerpc: set the driver.owner field for all vio drivers

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/drivers/char/hvcs.c b/drivers/char/hvcs.c
index 8486298..53dc77c 100644
--- a/drivers/char/hvcs.c
+++ b/drivers/char/hvcs.c
@@ -725,6 +725,7 @@
 	.remove		= hvcs_remove,
 	.driver		= {
 		.name	= hvcs_driver_name,
+		.owner	= THIS_MODULE,
 	}
 };