gluon-core: ignore is_outdoor_device() value on devices without 5GHz radio

package/gluon-config-mode-outdoor/luasrc/lib/gluon/config-mode/wizard/0250-outdoor.lua

 return function(form, uci)
 	local platform = require 'gluon.platform'
 
-	if not platform.is_outdoor_device() then
+	if not (platform.is_outdoor_device() and platform.device_uses_11a(uci)) then
 		-- only visible on wizard for outdoor devices
 		return
 	end

package/gluon-core/luasrc/lib/gluon/upgrade/180-outdoors

@@ -22,7 +22,7 @@ if sysconfig.gluon_version then
 	outdoor = false
 elseif config == 'preset' then
 	-- enable outdoor mode through presets on new installs
-	outdoor = platform.is_outdoor_device()
+	outdoor = platform.is_outdoor_device() and platform.device_uses_11a(uci)
 else
 	-- enable/disable outdoor mode unconditionally on new installs
 	outdoor = config

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

@@ -85,4 +85,17 @@ function M.device_supports_mfp(uci)
 	return supports_mfp
 end
 
+function M.device_uses_11a(uci)
+	local ret = false
+
+	uci:foreach('wireless', 'wifi-device', function(radio)
+		if radio.hwmode == '11a' or radio.hwmode == '11na' then
+			ret = true
+			return false
+		end
+	end)
+
+	return ret
+end
+
 return M