Move maxAcquired back to 1 and set maxDequeued

BufferQueue internally already limits number of acquired buffers to be 1
more than the maxAcquired set.  We want to be able to acquire 2, so
setting back to 1.  Enable triple buffering through maxDequeuedCount.

Bug: 146345307
Test: build, boot, turn BLAST ON, run manually, libgui_test
Change-Id: I1deff382da3b37a2bde840802fdc4c10a8b868ed