WifiConfigStore: Use the OEM migration hook

For OEM devices upgrading to wifi mainline module, we use the OEM
migration hook to allow the OEM's to parse their XML files and return
WifiConfiguration/SoftApConfiguration object representing the user's
data on disk.

Bug: 142394776
Test: atest com.android.server.wifi
Change-Id: I6f2f9275755d6ca25328328dba1f5fb94c1ca5f3
9 files changed
tree: bc04d5bf55c5fb92bfa1a855cccd0fcdbb2ea94f
  1. apex/
  2. service/
  3. PREUPLOAD.cfg