AX88180: add support for the Marvell 88E1118 phy

Some places in the current code equate the Marvell 88E1111 PHY as the family
when in reality it's a subpart of the Alaska family.  So once we generalize
that, add support for the 88E1118 PHY.

Signed-off-by: Hoan Hoang <hnhoan@i-syst.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>