Formalize WifiManager#requestActivityInfo as @SystemApi

Rename WifiManager#requestActivityInfo to
getWifiActivityEnergyInfoAsync and convert
ResultReceiver to a formal listener interface.

Bug: 145244073
Test: atest FrameworksWifiApiTests
Change-Id: I7f343c07b63c191082443bd8296a5569fb1c0d49
6 files changed