RFCOMM: Replace rfc.state with rfc.sm_cb.state

Introduce new state machine control block to hold port state.  Move port
state to sm_cb and change all references to reflect accordingly.

Bug: 361844445
Test: m Bluetooth
Flag: EXEMPT Mechanical Refactor
Change-Id: I8d4467f4deb63f1befa3097ddcd244a76042172b