PHY is mostly compatible with the existing VSC8244 PHY.  The init sequence
is different and the interrupt mask lacks some bits present in the VSC8244.

Rather than making a copy of the existing VSC234x config_intr function and
change one constant, I modify it to select the interrupt mask based on
which driver is calling it.  This lets it be used by both drivers.
Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>