brcm63xx: switch to board based failsafe networking

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/base-files/lib/preinit/05_init_interfaces_brcm63xx

@@ -1,37 +0,0 @@
-#!/bin/sh
-
-. /lib/brcm63xx.sh
-
-set_preinit_iface() {
-	case "$(brcm63xx_board_name)" in
-	agpf-s0 |\
-	bcm96348gw |\
-	bcm96348gw-10 |\
-	bcm96348gw-11 |\
-	bcm96358vw |\
-	bcm96358vw2 |\
-	cpva502p |\
-	dg834gt |\
-	dmv-s0 |\
-	dsl-2650u |\
-	dv-201amr |\
-	dva-g3810bn |\
-	f5d7633 |\
-	fast2404 |\
-	hg520 |\
-	magic |\
-	neufbox4 |\
-	rg100a |\
-	rta1025W |\
-	td-w8900gb |\
-	usr9108 |\
-	v2500v_bb)
-		ifname=eth1
-		;;
-	*)
-		ifname=eth0
-		;;
-	esac
-}
-
-boot_hook_add preinit_main set_preinit_iface