p2p: enable P2P random MAC if driver supports

Bug: 118904478
Test: Unit test - atest frameworks/opt/net/wifi/tests/wifitests
Test: manual test
  * Enter WiFI Direct Page
  * check the feature is enabled in logcat
    * WifiP2pService: Supported feature: P2P MAC randomization
  * check p2p0 MAC address is randomized

Change-Id: I2dbf93d0c231ae28724aff871b2cb46a65557e7a
8 files changed