CRAS: audio_thread - remove wake threshold check.
CRAS: audio_thread - remove wake threshold check.

It was only being used by input and even then only to check if the
device is running.  Just check if the device is running, skipping the
threshold check.

Change-Id: I74c2f1e0293d194fc087e9af098eb3b12af82136
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/172993
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>

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