gluon-core: use HE radio mode if available

Configure a radio for HE (802.11ax) operation in case it's supported by
the hardware. This can be the case for 2.4 GHz as well as 5 GHz.

Signed-off-by: David Bauer <mail@david-bauer.net>

package/gluon-core/luasrc/lib/gluon/upgrade/200-wireless

@@ -74,6 +74,10 @@ local function get_htmode(radio)
 	end
 
 	local phy = wireless.find_phy(radio)
+	if iwinfo.nl80211.hwmodelist(phy).ax then
+		return 'HE20'
+	end
+
 	if iwinfo.nl80211.hwmodelist(phy).ac then
 		return 'VHT20'
 	end