cras_test_client - Remove unused command line arguments.
cras_test_client - Remove unused command line arguments.

Remove the following arguments:

  callback_threshold
  min_cb_level
  write_full_frames

They are not used since we changed to unified stream.

BUG=None
TEST=Run audiovideo_LineOutToMicInLoopback on link

Change-Id: I5efe0dc9c87340f07f53eedabb88d2b6a55f1035
Reviewed-on: https://chromium-review.googlesource.com/180833
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Commit-Queue: Owen Lin <0a54d949e4b0b01f23b9b06ccd3e0b748fb4eb25@chromium.org>
Tested-by: Owen Lin <0a54d949e4b0b01f23b9b06ccd3e0b748fb4eb25@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd