ar8216: Fix issue with autoneg being disabled under 3.14, revert 43332

Patch reverts 43332 which seems to cause issues with VLAN functionality.
Add a specific check to check whether ANEG is still enabled and re-enable
it if necessary. Disable generic phy soft reset for kernel >=3.16.

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43356 3c298f89-4303-0410-b956-a3cf2f4a3e73