opt/net/wifi/util: add WPA2 symbol

For apps compatibility, add "WPA2" for WPA2 network, in the same time
keep "RSN" for WPA2 and WPA3 network.

Test: atest android.net.wifi
Test: atest com.android.server.wifi
Test: ACTS WifiNetworkRequestTest to print out scan result
Bug: 135733338
Change-Id: I133b52b9b0d7b94680394b4b0e22f4eb77b9ee25
2 files changed