WifiManager: Deprecate API implementation

Changes:
a) Pass the calling package name in the AIDL call to allow target-SDK
checks & error logging on the service side (similar to other binder calls).
b) Pass the return value from service for AIDL calls: disconnect,
reconnect, reassociate.
c) Return false for a previously deprecated saveWifiConfiguration API.

Bug: 115504728
Test: Compiles
Change-Id: I9bc9c8fc5857a430242e5afbecca7fc2c39f1ca1