net: dsa: add Broadcom tag RX/TX handler

Add support for the 4-bytes Broadcom tag that built-in switches such as
the Starfighter 2 might insert when receiving packets, or that we need
to insert while targetting specific switch ports. We use a fake local
EtherType value for this 4-bytes switch tag: ETH_P_BRCMTAG to make sure
we can assign DSA-specific network operations within the DSA drivers.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/dsa.h
Simple merge

diff --cc net/dsa/Kconfig
Simple merge

diff --cc net/dsa/Makefile
Simple merge

diff --cc net/dsa/dsa_priv.h
Simple merge

diff --cc net/dsa/slave.c
Simple merge

diff --cc net/dsa/tag_brcm.c
Simple merge