zenfone9: Enable support for IEEE80211AX

 * This is to allow supporting WiFi 6 mobile hotspots,
   to be noted this is only supported on SDM855+ platforms.

Change-Id: Iab61bd12499968e8823b3078acd1c7b8bce46136
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 1a72a59..5561fa4 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -264,3 +264,4 @@
 
 CONFIG_ACS := true
 CONFIG_IEEE80211AC := true
+CONFIG_IEEE80211AX := true