net: dsa: point out the tail taggers

From a  recent commit with the same summary:

"The Marvell 88E6060 uses tag_trailer.c and the KSZ8795, KSZ9477 and
KSZ9893 switches also use tail tags."

Set "tail_tag" to true for KSZ8795 and KSZ9477 which were missing in the
original commit.

Fixes: 7a6ffe7 [net] ("net: dsa: point out the tail taggers")
Signed-off-by: Christian Eggers <ceggers@arri.de>

net/dsa/tag_ksz.c

@@ -123,6 +123,7 @@ static const struct dsa_device_ops ksz8795_netdev_ops = {
 	.xmit	= ksz8795_xmit,
 	.rcv	= ksz8795_rcv,
 	.overhead = KSZ_INGRESS_TAG_LEN,
+	.tail_tag = true,
 };
 
 DSA_TAG_DRIVER(ksz8795_netdev_ops);
@@ -199,6 +200,7 @@ static const struct dsa_device_ops ksz9477_netdev_ops = {
 	.xmit	= ksz9477_xmit,
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ9477_INGRESS_TAG_LEN,
+	.tail_tag = true,
 };
 
 DSA_TAG_DRIVER(ksz9477_netdev_ops);