ar8216: simplify PHY fixup/init

Move the PHY fixup call to the PHY init loop.
Use ar8xxx_has_gige in the PHY init instead of passing the gigE
capability via function parameter.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43333 3c298f89-4303-0410-b956-a3cf2f4a3e73