CRAS: Increase speex resampler quality from 0 to 4.
CRAS: Increase speex resampler quality from 0 to 4.

After the optimization change for speex in
https://chromium-review.googlesource.com/#/c/173662/, now we can afford
to increase the quality factor. The cpu usage is less than before even
with the increased quality factor. This uses longer filter and gives
better frequency result at high frequency.

(This is a resubmit.)

BUG=chrome-os-partner:23275
TEST=(1) build for daisy and parrot (2) run aplay -f dat /dev/zero in one
terminal (3) play 44.1k wav file in another terminal (4) use "perf" to check
cpu used for libspeexdsp.

Change-Id: I31047f553d1d10123bc2b1e77666e44354b9a069
Reviewed-on: https://chromium-review.googlesource.com/176201
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>
Commit-Queue: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>
Tested-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>

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