WifiConfigStoreData: Remove unwanted elements

Changes in the CL:
1. There is no need for us to persist the last network ID
allocated. This should be a simple counter which is
recreated on every startup.
2. Don't persist bssid blacklist. This is deprecated and will soon be
removed altogether from WifiConfigManager.

BUG: 29435647
BUG: 29449615
Change-Id: I5ac66f616d1d00ec5a2f9fa722ae23f6c8bed4aa
TEST: Unit tests
3 files changed
tree: 9c6ce2a7d11a749fd866a306e7db5727b5a5a76e
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/