RFCOMM: Update sm_cb where relevant

- Update the state and open_timestamp in new rfc_set_state function
- Update the event when we call port_sm_execute
- Update the close_reason when we close the port

Bug: 374989690
Test: atest RfcommTest
Flag: EXEMPT no-op
Change-Id: Icaa04a7caa3b52ae3e988109b11f72ec509fad09