p2p: add annotation for WifiP2pConfig.Builder public API

Bug: 126614191
Bug: 126700789
Test: Unit tests - atest FrameworksWifiTests
Test: Unit tests - atest FrameworksWifiApiTests
Change-Id: Ib47a1a6d7b72977d22c8402a6229de9a631d728e
2 files changed