Display WiFi Version number

- Display these type and hide the item in other case
   WIFI_STANDARD_11AX(6) WiFi 6
   WIFI_STANDARD_11AC(5) WiFi 5
   WIFI_STANDARD_11N (4) WiFi 4

-Screenshot
 https://photos.app.goo.gl/BbyZEQFyganEPfuw8

Bug: 117216087
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=WifiDetailPreferenceController2Test

Change-Id: Ic360e501d2e3bd80ce3bcb3ddf529ec5d00c1bcc