Remove incoming HFP connection if outgoing exists

If head-unit and phone request the HFP connection at the same time,
the incoming HFP port is opened and it tries to allocate a new
control block which is failed due to an already existing one for
outgoing HFP connection. Then BTA_HF_CLIENT_RFC_CLOSE_EVT message
is sent with handle 0 which is not handled to close the incoming
HFP port. This is the reason that ACL is not disconnected while
disconnecting BT.

Therefore, incoming HFP Rfcomm connection is removed if outgoing
HFP connection exist.

Bug: 173464597
Test: Manual
Change-Id: I4bc9a99a5ff5bc9268ead3f5d25ff84c9c0243a1