WifiMigration: Remove loadFromConfigStore & removeConfigStore

In preparation of moving away from this API surface to a different
mechanism.

Bug: 149418926
Test: Device boots up and connects to wifi networks.
Change-Id: Iaa27ea7b69694d41d900fc39116ad2a43d8f8bfa
1 file changed
tree: b71ec93c0968df7668ed94a59a0d18142320f877
  1. framework/
  2. OsuLogin/
  3. OWNERS