Fix unit tests to run on R

Modules fixed:
1. com.android.server.wifi.WifiApConfigStoreTest
2. com.android.server.wifi.SoftApStoreDataTest

Note: Make mac randomization to default support
in WifiApConfigStoreTest to match the real use case

Bug: 179512200
Test: atest com.android.server.wifi on R device
Test: atest com.android.server.wifi on S device
Change-Id: Ic7e8ad885c15f52c11c9d10366f3a4e56c0d421c
4 files changed