brcm63xx: remove obsolote preinit scripts and fix preinit iface script

These scripts were causing ip issues in the latest version of LEDE:
https://gist.github.com/Noltari/6d20d8bcbe236caf516c0a73f5477d00

Fixes preinit iface script by making eth0 the default ifname and only changing
it to eth1 for the devices that specifically need it.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/brcm63xx/base-files/lib/preinit/05_failsafe_config_switch_brcm63xx

@@ -1,10 +0,0 @@
-#!/bin/sh
-
-failsafe_ip() {
-	[ -n "$pi_ifname" ] && grep -q "$pi_ifname" /proc/net/dev && {
-        	ifconfig $pi_ifname $pi_ip netmask $pi_netmask broadcast $pi_broadcast up
-        }
-}
-
-boot_hook_add failsafe failsafe_ip
-

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

@@ -4,45 +4,33 @@
 
 set_preinit_iface() {
 	case "$(brcm63xx_board_name)" in
-	a4001n |\
-	a4001n1 |\
-	ar-5381u |\
-	ar-5387un |\
-	bcm963281tan |\
-	bcm96328avng |\
-	cpva642 |\
-	ct536_ct5621 |\
-	cvg834g |\
-	dgnd3700v1_dgnd3800b |\
-	dsl-2640b-b |\
-	dsl-274xb-c |\
-	dsl-274xb-f |\
-	dsl-275xb-d |\
-	fast2504n |\
-	fast2704v2 |\
-	hg553 |\
-	hg556a_* |\
-	hg520 |\
-	hg622 |\
-	neufbox6 |\
-	p870hw-51a_v2 |\
-	rta770bw |\
-	rta770w |\
-	spw303v |\
-	spw500v |\
-	v2110 |\
-	vr-3025un |\
-	vr-3025u |\
-	vr-3026e |\
-	wap-5813n)
-		ifname=eth0
-		;;
+	agpf-s0 |\
 	bcm96348gw |\
+	bcm96348gw-10 |\
 	bcm96348gw-11 |\
-	gw6000 |\
-	gw6200)
+	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
 }
 

target/linux/brcm63xx/base-files/lib/preinit/15_set_preinit_interface_brcm63xx

@@ -1,27 +0,0 @@
-#!/bin/sh
-
-port_net_echo() {
-	[ -n "$pi_ifname" ] && grep -q "$pi_ifname" /proc/net/dev && {
-		if [ "$pi_preinit_net_messages" = "y" ] || [ "$pi_failsafe_net_message" = "true" ] && [ "$pi_preinit_no_failsafe_netmsg" != "y" ]; then 
-			netmsg $pi_broadcast "$1"
-		fi
-	}
-}
-
-preinit_ip_deconfig() {
-	if [ -z "$pi_ifname" ]; then
-		ifconfig $ifname 0.0.0.0 down
-	else
-		grep -q "$pi_ifname" /proc/net/dev && {
-			ifconfig $pi_ifname 0.0.0.0 down
-		}
-	fi
-}
-
-preinit_net_echo() {
-	preinit_ip
-
-	port_net_echo $1
-}
-
-

target/linux/brcm63xx/base-files/lib/preinit/20_failsafe_net_echo_brcm63xx

@@ -1,12 +0,0 @@
-#!/bin/sh
-
-indicate_failsafe() {
-	preinit_net_echo() {
-		port_net_echo $1
-	}
-	echo "- failsafe -"
-	preinit_net_echo "Entering Failsafe!\n"
-	indicate_failsafe_led
-}
-
-