Default existing WifiConfiguration's mac setting to trusted

To support seamless migration from P to Q, set macRandomizationSetting
for existing WifiConfiguration(s) to trusted mode.

Bug: 119212980
Test: unit tests
Test: flash P build to phone, add networks. Flash change to phone and
verify that the macRandomizationSetting for existing saved
WifiConfiguration is set to trusted mode.

Change-Id: I29af425268c7cbd0e8aaad204b982529326b6379
2 files changed