WifiManager: Add privileged API for removing app state

This will perform the same operations as what the wifi stack does on an
app removal. This is useful/critical in some CTS test cases especially
related to suggestions/specifier (since the expected user flow changes
based on previous approvals, etc).

Bug: 13332558
Test: atest com.android.server.wifi
Test: atest android.net.cts.wifi
Change-Id: I4013235b37590a313d2f60268f4b6715c4baa4d9
7 files changed