Update btif_profile_queue to use the list data structure.

Update btif_profile_queue to use the list data structure.

The profile queue maintains a list of pending connect operations
for each profile. If a connect is followed by a disconnect before
the queued connect is dispatched, the disconnect will have no
effect and the connect will proceed.

This code clearly needs to be re-thought; it may be a good idea to
abandon the connect queue entirely in the long-run.

Change-Id: Ic0e85654abcf7a47f65953edb301eb9524394950