CRAS: Update the biquad formula used in the crossover filter.

This makes the biquad formula used in the crossover filter the same as
the one used in the eq filters.

BUG=none
TEST=run crossover_test before and after change, verify the difference
of outputs is small using cmpraw.
Change-Id: Ie7b9b6b57aa51ea6b18ea1411b73ad0aff5a2bd5
Reviewed-on: https://gerrit.chromium.org/gerrit/61250
Commit-Queue: Chih-Chung Chang <chihchung@chromium.org>
Reviewed-by: Chih-Chung Chang <chihchung@chromium.org>
Tested-by: Chih-Chung Chang <chihchung@chromium.org>
1 file changed