Most ipq806x platforms use an ethernet switch, and the new upstream
GMAC driver makes use of the Fixed PHY emulation to force the link
settings despite the lack of PHY.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45830 3c298f89-4303-0410-b956-a3cf2f4a3e73