Revert "base-files: migrate old UCI network bridge ports syntax"

This reverts commit f716c30241.

Migrating everyone to the new syntax could break downgrades. We may
reintroduce it way later if needed.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

package/base-files/files/etc/uci-defaults/11_network-migrate-bridges

@@ -1,23 +0,0 @@
-. /lib/functions.sh
-
-migrate_ports() {
-	local config="$1"
-	local type ports ifname
-
-	config_get type "$config" type
-	[ "$type" != "bridge" ] && return
-
-	config_get ports "$config" ports
-	[ -n "$ports" ] && return
-
-	config_get ifname "$config" ifname
-	[ -z "$ifname" ] && return
-
-	for port in $ifname; do uci add_list network.$config.ports="$port"; done
-	uci delete network.$config.ifname
-}
-
-config_load network
-config_foreach migrate_ports device
-
-exit 1