On some devices with e.g. a BCM2535F switch the second MAC is used, but
we can not find a phy under all addresses between 0 and 31, 0xffffffff
is returned as phy id. If we can not find a phy at the expected address
create a dummy one.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
SVN-Revision: 38538
