Migrate WifiInfo/ScanResult raw field access to getters/setters

Also renamed WifiSsid.NONE to WifiManager.UNKNOWN_SSID.

Bug: 144311098
Test: atest FrameworksWifiTests
Change-Id: I0b0179da3c984723cf3f95ea74ca449cb342847d
20 files changed
tree: 4b9336ef0954bfc5f2d5bdf6a27bb79ed77ff11a
  1. service/
  2. PREUPLOAD.cfg