p2p: do P2P factory reset for Network Reset

Bug: 109866998
Test: * manual trigger network reset in below conditions:
        * trigger network reset with P2P on
        * trigger network reset with WiFi on, P2P off
        * trigger network reset with WiFi off
        * trigger network reset with WiFi off then do reboot
      * check groups shown in WiFi Direct page
      * use wpa_cli -i p2p0 list_network
Test: RobotTest - make ROBOTEST_FILTER=ResetNetworkConfirmTest

Change-Id: If5292e34cb9702d4319a4c9bbd867e0e5ed716a2