[RFC] iosched: add cfq -> bfq alias

[Xose Vazquez Perez <xose.vazquez@xxxxxxxxx>]

Avoid break old scrips and udev rules.

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 95586137194e..8c6c82860a45 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -6914,6 +6914,7 @@ static struct elevator_type iosched_bfq_mq = {
 	.icq_align =		__alignof__(struct bfq_io_cq),
 	.elevator_attrs =	bfq_attrs,
 	.elevator_name =	"bfq",
+	.elevator_alias =	"cfq",
 	.elevator_owner =	THIS_MODULE,
 };
 MODULE_ALIAS("bfq-iosched");