WifiScanningSevice: Create multiple scanner impls

Creates scanner impl objects when new iface is added and destroys
it when an existing iface is removed.

Note: The scan state machines still use any of the available one. Will
be fixed up in following CL's.

Bug: 140111024
Test: atest com.android.server.wifi.scanner

Change-Id: I5c61c3c083e5739b663fa0f12fdecc262e971d0f
2 files changed
tree: 61e6cd7de9ffbd23a66a513434a787785803a022
  1. service/
  2. PREUPLOAD.cfg