btif_sock_rfc: log rfc_port_handle before crash

create_srv_accept_rfc_slot will crash if accept_rs and srv_rs get the
same port handle.  Log the port handle before the crash for better
debugging.

Bug: 330829481
Test: m Bluetooth
Flag: EXEMPT logging change only
Change-Id: Iff0872085cf2fbce8fcc7d6448e04baf5449d24d