Remove channel connection timeouts

Defer timeout to lower layer.
Remove hex values for psms
Formalize cid name change to abstract away actual l2cap channel
identifiers from clients.
  (cid) channel_id ==>  connection interface descriptor

Bug: 141758481
Test: Compiles
Change-Id: I3af9a79d7fd721d0d58b131e15cdd7c0204b90cf