brcm47xx: add gpio to irq function again


git-svn-id: svn://svn.openwrt.org/openwrt@35321 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm47xx: add initial board detection code


git-svn-id: svn://svn.openwrt.org/openwrt@35322 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm47xx: create image for Netgear WNDR3400 V1


git-svn-id: svn://svn.openwrt.org/openwrt@35323 3c298f89-4303-0410-b956-a3cf2f4a3e73