Allow setting different levels of MAC randomization for each network. For now, we are going to support "Persistent" which generates randomized MAC once and persist that MAC, and "Trusted" which uses the factory MAC. Bug: 118396042 Test: Existing unittest verifying parcel Test: adb shell dumpsys wifi | grep -B8 "MacRandomizationSetting" Change-Id: I067f21a9a9a42370aa8dfe80b05aef3a4f9a7fad