Restore PHY_ID_BCM54811 accidently removed by commit 5d4358ed.

Fixes: 5d4358ed ("net: phy: broadcom: Allow BCM54210E to configure APD")
Signed-off-by: Kevin Lo <kevlo@kevlo.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>