Use ACL handle to find element to deal with packet

We encountered that when executing the buffer_packet,
but the ACL connection had been removed. So It will
lead to a crash.

Then we can use ACL handle to find the detail ACL handler
to deal with the ACL packet. Even if the ACL connection
vanished, then just ignore the detail packet handling because
the connection vanished.

Bug: 251764426
Test: Restart bluetooth, connect to other remote device,
      then watch if it running OK

Change-Id: Ic578d41ae80ec6a254a42759081dcd115cf1990b