Wifi: Settings to have access to Wifi technology

This CL adds to WifiInfo structure information about the Wifi
technology.
This makes it available to Settings app to use to present in
user interface.

Bug: 138634524
Bug: 140168755
Test: atest com.android.wifi.server
Change-Id: I8aae8e8928462be7729c85fc15e0e7bdd97c1e6e