p2p: mirgrate p2p into tethering modes

Bug: 137602441
Bug: 139783330
Test: atest FrameworksNetTests
Test: atest FrameworksWifiTests
Test: CtsVerifier - Wi-Fi Direct
Test: Enable hotspot when P2P GO is running
      * P2P GO is terminated
      * hotspot is running
Test: Enable P2P GO when hotspot is running
      * hotspot is intact
      * P2P GO could not be launched
Test: Verify P2P functions with legacy WifiP2pService

Change-Id: Icb2e2b106ae52b19af29b7a1ebc55d3cdf80db9c