CRAS: alsa helper - support 16k sample rate.
CRAS: alsa helper - support 16k sample rate.

Some webcams (including some models of the logitech 9000 quickcam,
only support 16000Hz sampling rate, add that to the list of sample
rates to check for.

BUG=chromium-os:33009
TEST=plug in logitech 9000 webcam M/N:V-UBM46 enter hangout and check
that mic works.

Change-Id: I73966a1e948a6825b2545861ddcca611e5b9aedc
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/41312
Reviewed-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>

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