Add support for legacy Broadcom tags, which are similar to DSA_TAG_PROTO_BRCM.
These tags are used on BCM5325, BCM5365 and BCM63xx switches.
Signed-off-by: NÁlvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>