generic: ar8216: add ar8xxx_start helper

Move switch starting code into a separate function.
This makes it usable from other places.

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

git-svn-id: svn://svn.openwrt.org/openwrt@36049 3c298f89-4303-0410-b956-a3cf2f4a3e73
generic: ar8216: start AR8327 switch from the probe routine

The AR8327 switch gets its configuration from platform
data or from the device-tree. This allows to start it
from the probe routine. Doing so makes it usable with
ethernet drivers which only connects to the PHY device
when the ethernet interface is opened.

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

git-svn-id: svn://svn.openwrt.org/openwrt@36050 3c298f89-4303-0410-b956-a3cf2f4a3e73