kernel: add driver for Marvell 88E6171 switch

This is a swconfig driver for the Marvell 88E6171 switch,
which is a 7-port GigE switch with two CPU ports and 64
802.1q VLANs.

Signed-off-by: Claudio Leite <leitec@staticky.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43486 3c298f89-4303-0410-b956-a3cf2f4a3e73
kirkwood: enable mvsw6171 switch driver on EA4500

Signed-off-by: Claudio Leite <leitec@staticky.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43487 3c298f89-4303-0410-b956-a3cf2f4a3e73
realview: fix up the phyoffset patch

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43488 3c298f89-4303-0410-b956-a3cf2f4a3e73