ar8216: disable EEE by default on AR8327 to fix stability issues (#14597)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41577 3c298f89-4303-0410-b956-a3cf2f4a3e73