generic: ar8216: don't use mdio bus specific functions in ar8216_id_chip

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35517 3c298f89-4303-0410-b956-a3cf2f4a3e73
generic: ar8216: simplify phy features setup

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35518 3c298f89-4303-0410-b956-a3cf2f4a3e73