lantiq: Support newer versions of the PEF7071 ethernet PHYs

The BT Home Hub 5A uses three PEF7071 with PHY ID 0xd565a401. Daniel's
PHY driver (for his u-boot sources) already supports that PHY because
it uses a PHY ID mask of 0xfffffff8.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46670 3c298f89-4303-0410-b956-a3cf2f4a3e73