sfc: Add support for SFE4003 board and TXC43128 PHY

This board never went into production, but some engineering samples
are in use.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/sfc/Makefile
Simple merge

diff --cc drivers/net/sfc/falcon.c
Simple merge

diff --cc drivers/net/sfc/falcon_boards.c
Simple merge

diff --cc drivers/net/sfc/phy.h
Simple merge

diff --cc drivers/net/sfc/txc43128_phy.c
Simple merge