gluon-core, gluon-setup-mode: reset ifname sysconfigs on each update

Allow interface names to change on updates to handle hwconfig -> DSA and
similar migrations.

package/gluon-core/luasrc/lib/gluon/upgrade/020-interfaces

@@ -1,15 +1,8 @@
 #!/usr/bin/lua
 
-local sysconfig = require 'gluon.sysconfig'
-
--- Are we already set up?
-if sysconfig.lan_ifname or sysconfig.wan_ifname then
-	os.exit(0)
-end
-
-
 local platform = require 'gluon.platform'
 local site = require 'gluon.site'
+local sysconfig = require 'gluon.sysconfig'
 
 local json = require 'jsonc'
 local uci = require('simple-uci').cursor()

package/gluon-setup-mode/luasrc/lib/gluon/upgrade/320-setup-ifname

@@ -3,11 +3,6 @@
 local platform = require 'gluon.platform'
 local sysconfig = require 'gluon.sysconfig'
 
-
-if sysconfig.setup_ifname then
-	os.exit(0)
-end
-
 if platform.is_outdoor_device() then
 	sysconfig.setup_ifname = sysconfig.wan_ifname or sysconfig.lan_ifname
 else