Reset rate estimator whenever iodev is opened

Rate estimator is not cleaned up when iodev is closed. This may result
in certain sample rate estimation using stale data.

To solve the issue, always reset the rate estimator whenever iodev is
opened.

BUG=b:315782367
TEST=unit tests

Change-Id: I30cccca08102105e50d8bfefe5cdceb2e03f1919
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/5138639
Reviewed-by: Li-Yu Yu <aaronyu@google.com>
Commit-Queue: Li-Yu Yu <aaronyu@google.com>
Tested-by: chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com <chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com>
Auto-Submit: Baili Deng <bailideng@google.com>

cras/src/server/cras_iodev.c

@@ -1131,6 +1131,8 @@ int cras_iodev_open(struct cras_iodev* iodev,
       return rc;
     }
   }
+  // Always reset rate_est to ensure rate estimation correctness.
+  rate_estimator_reset_rate(iodev->rate_est, iodev->format->frame_rate);
 
   clock_gettime(CLOCK_MONOTONIC_RAW, &beg);
   rc = iodev->configure_dev(iodev);