Bluetooth: Handle concurrent pairing req from same device properly

- Respond with negative pin reply, if pin request comes with high
  security with pairing procedure initiated from DUT for the same
  device DUT is already in pairing state.

- This case comes, when low security profile connection, high
  security profile connections are initiated back to back from
  the same remote device.

CRs-Fixed: 750386
Change-Id: I4988c224d35353d5e1742baa45eae89cf0596823
1 file changed