mcs814x: use the standard device tree binding to represent a PHY node

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36059 3c298f89-4303-0410-b956-a3cf2f4a3e73
mcs814x: implement MULTI_IRQ_HANDLER

Allows us to get rid of the IRQ entry point assembly

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36060 3c298f89-4303-0410-b956-a3cf2f4a3e73