Ignore calls to set the address policy after it has already been set

Bug: 239792403
Bug: 237572866
Bug: 195410559
Change-Id: I92e7d482da8aa3afd9b7610fc0cf92f2c5357270
Test: system/gd/cert/run --clean --sl4a OobPairingSl4aTest
Test: system/gd/cert/run --clean --sl4a_sl4a OobPairingTest
Tag: #refactor
Ignore-AOSP-First: Security fix