Remove unused entry into l2cap

Entry point is after chained commands from
maybe_chain_more_commands_after_read_remote_version_complete

Bug: 232442249
Tag: #refactor
Test: gd/cert/run
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: I77f5e61be5162e6539b47823512f4537fedec392