Add volume curve for Falco.
Add volume curve for Falco.

Volume curve tested with the latest EQ/DRC.

BUG=chrome-os-partner:21631
TEST=manual, listen to volume curve.

Change-Id: I9e2b08f734f46700e448bd858d790ead62ebe57f
Reviewed-on: https://chromium-review.googlesource.com/66975
Reviewed-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>
Tested-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Commit-Queue: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>

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