Fix MAC address getters for current OpenWRT

package/gluon-core/files/lib/gluon/upgrade/core/initial/011-gluon-network

@@ -34,10 +34,10 @@ EOF
 get_main_address() {
     case "$board" in
 	tl-wdr3600|tl-wdr4300)
-	    uci get wireless.radio1.macaddr
+	    cat /sys/class/ieee80211/phy1/macaddress
 	    ;;
 	*)
-	    uci get wireless.radio0.macaddr
+	    cat /sys/class/ieee80211/phy0/macaddress
 	    ;;
     esac
 }

package/gluon-core/generate/lib/gluon/upgrade/core/initial/010-gluon-system

@@ -7,7 +7,7 @@ board="$(ar71xx_board_name)"
 case "$board" in
 tl-wdr3600|\
 tl-wdr4300)
-	macaddr="$(uci get wireless.radio1.macaddr)"
+	macaddr="$(cat /sys/class/ieee80211/phy1/macaddress)"
 
 	uci -q batch <<EOF
 		set system.led_wlan2g.trigger='netdev'
@@ -23,7 +23,7 @@ tl-wdr4300)
 EOF
 	;;
 *)
-	macaddr="$(uci get wireless.radio0.macaddr)"
+	macaddr="$(cat /sys/class/ieee80211/phy0/macaddress)"
 
 	uci -q batch <<EOF
 		set system.led_wlan.trigger='netdev'