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It is possible to set fixed sample rate in cast_shell on Linux with
--alsa-fixed-output-sample-rate, but it wasn't possible on Fuchsia.
Added --audio-output-sample-rate, which allows to set fixed sample rate
on both platforms. For backward compatibility kept the old ALSA-specific
flag, but it's marked as deprecated now.

Bug: 772488
Change-Id: I0f980f09b432768ff9bb51191a9b1ec31e89274f
Reviewed-on: https://chromium-review.googlesource.com/798066Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521050}