netmode: disable firewall for l2 netmode

since the intent for l2 netmode is to accept all traffic, hence,
disable firewall on top of zone lan's input/output/forward being
ACCEPT/ACCEPT/ACCEPT

Please note: when firewall is disabled, it esentially set's input
to ACCEPT, it does not stop or disable fw3.

netmode/files/etc/uci-defaults/netmode.l2mode

@@ -98,6 +98,10 @@ l2_network_config() {
 	# Update CWMP Agent WAN Interface
 	uci -q set cwmp.cpe.default_wan_interface="lan"
 	uci -q commit cwmp
+
+	# disable firewall
+	uci -q set firewall.globals.enabled="0"
+	uci -q commit firewall
 }
 
 network_mode="$(fw_printenv -n netmode 2>/dev/null)"