WifiScanningService: Move ScannerImpl setup/teardown

The Scanner impl setup/teardown is a global operations. Move it out of
the bg scan state machine.

Bug: 140111024
Test: atest com.android.server.wifi.scanner
Change-Id: I7d6f821b6474c4b7d9f98faa4e00d322b3e949b6
1 file changed
tree: 670583e22a938ac830004791658e5aad7b1fb95f
  1. service/
  2. PREUPLOAD.cfg