Create Mainline wifi stack module

a) Moved wifi service to a separate APK (WifiStack)
b) Converted all the .mk to .bp
c) Changed all the wifi services to inherit from a new WifiServiceBase
class (away from SystemService because we're no longer in system_server).
d) WifiStackService is the entry point into the APK entry. This will be
invoked from WifiStackClient running in system_server after
PHASE_SYSTEM_SERVICES_READY in android framework boot sequence.
e) Added a bunch of new .rc rules to help change ownership of all the
config store files.
f) Changed the |setPackage| on a bunch of private broadcasts triggered
for notification actions (from "android" to the new retrieved package
name).
g) Changed WifiScanner permission checks to use MAINLINE_WIFI_STACK
permission instead of NETWORK_STACK.

Bug: 113174748
Test: atest com.android.server.wifi
Test: Device boots up & connects to wifi networks, hotspot toggle, etc.
Test: Will send for regression tests
Change-Id: I87b83704c33694fcc99d2d9bde4e5cad9ddd06da
37 files changed