net: phy: bcm54140: add second PHY ID

This PHY has two PHY IDs depending on its mode. Adjust the mask so that
it includes both IDs.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>