Add irq-domain aware irqchip drivers for the irq controllers of bcm63xx and switch to use them. Signed-off-by: Jonas Gorski <jogo@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43454 3c298f89-4303-0410-b956-a3cf2f4a3e73