alsa_api_test: Tolerate more sample consumption rate fluctuation

Loose the threshold of checking device consumes rate.

BUG=chromium:617516
TEST=run alsa_api --move test on auron_paine for 10 times.

Change-Id: I8e1d65c41aa2429de469eb17e26f492e7c40cd83
Reviewed-on: https://chromium-review.googlesource.com/355818
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
1 file changed