bcm53xx: bcma: get IRQs also from device tree

Add patches for getting the IRQ number for a device of the bcma bus 
that were send for upstream inclusion.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43148 3c298f89-4303-0410-b956-a3cf2f4a3e73