gluon-core: gluon.util: change find_phy argument to config table and make public

package/gluon-core/luasrc/usr/lib/lua/gluon/util.lua

@@ -149,9 +149,7 @@ local function find_phy_by_macaddr(macaddr)
 	end
 end
 
-local function find_phy(radio)
-	local config = uci:get_all('wireless', radio)
-
+function find_phy(config)
 	if not config or config.type ~= 'mac80211' then
 		return nil
 	elseif config.path then
@@ -164,7 +162,7 @@ local function find_phy(radio)
 end
 
 local function get_addresses(radio)
-	local phy = find_phy(radio)
+	local phy = find_phy(uci:get_all('wireless', radio))
 	if not phy then
 		return function() end
 	end