Add a rudimentary Clause 45 driver for the BCM84881 PHY, found on
Methode DM7052 SFPs.
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>