Camera3Device: Correctly shut down abandoned streams

If a stream was abandoned (consumer died), the stream teardown would
terminate early. Update teardown conditions to complete even for the
abandoned state.

One consequence of this is that the buffer manager never received an
unregister call for the stream, leading it to error out when trying to
remove buffers from it.

Also switch to STATE_ABANDONED in case of an error detaching a buffer,
instead of the error state.

Bug: 29778464
Change-Id: I44de69773e8bbf9ebe83207498d6ee0674ed91bf