interface for nfc handover supplicant commands

expose:
  NFC_GET_HANDOVER_SEL
  NFC_GET_HANDOVER_REQ
  NFC_REPORT_HANDOVER

These are used in for setting up WFD with NFC and
are only accessible given the CONNECTIVITY_INTERNAL
permission.

Change-Id: Ia43afc137d474822cad896d335530654081a808c

wifi/java/android/net/wifi/p2p/IWifiP2pManager.aidl

@@ -26,6 +26,7 @@ import android.os.Messenger;
 interface IWifiP2pManager
 {
     Messenger getMessenger();
+    Messenger getP2pStateMachineMessenger();
     void setMiracastMode(int mode);
 }