CRAS: Use metrics_stub.cc in iodev unittest

Let iodev unittest use the stubs in metrics_stub.cc instead of its own
duplicated ones. This is a functional no-op.

BUG=b:250544745
TEST="FEATURES=test USE=asan emerge-brya adhd"

Change-Id: I1f7cbc870f1d508f790a0e0ee237a53c2cd8c6c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/5170387
Tested-by: chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com <chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Commit-Queue: Ben Zhang <benzh@chromium.org>

cras/src/tests/BUILD.bazel

@@ -1397,6 +1397,7 @@ cc_test(
     name = "iodev_unittest",
     srcs = [
         ":iodev_unittest.cc",
+        ":metrics_stub.cc",
         "//cras/src/common:cras_selinux_helper_stub.c",
         "//cras/src/common:cras_shm.c",
         "//cras/src/common:cras_string.c",

cras/src/tests/iodev_unittest.cc

@@ -3167,29 +3167,6 @@ int cras_audio_thread_event_dev_overrun() {
   return 0;
 }
 
-int cras_server_metrics_device_open_status(struct cras_iodev* iodev,
-                                           enum CRAS_DEVICE_OPEN_STATUS code) {
-  return 0;
-}
-
-int cras_server_metrics_device_runtime(struct cras_iodev* iodev) {
-  return 0;
-}
-
-int cras_server_metrics_device_volume(struct cras_iodev* iodev) {
-  return 0;
-}
-
-int cras_server_metrics_device_sample_rate(struct cras_iodev* iodev) {
-  return 0;
-}
-
-int cras_server_metrics_device_configure_time(struct cras_iodev* iodev,
-                                              struct timespec* beg,
-                                              struct timespec* end) {
-  return 0;
-}
-
 void ewma_power_init(struct ewma_power* ewma,
                      snd_pcm_format_t fmt,
                      unsigned int rate){};

cras/src/tests/metrics_stub.cc

@@ -19,6 +19,20 @@ int cras_server_metrics_device_runtime(struct cras_iodev* iodev) {
   return 0;
 }
 
+int cras_server_metrics_device_volume(struct cras_iodev* iodev) {
+  return 0;
+}
+
+int cras_server_metrics_device_sample_rate(struct cras_iodev* iodev) {
+  return 0;
+}
+
+int cras_server_metrics_device_configure_time(struct cras_iodev* iodev,
+                                              struct timespec* beg,
+                                              struct timespec* end) {
+  return 0;
+}
+
 int cras_server_metrics_highest_device_delay(
     unsigned int hw_level,
     unsigned int largest_cb_level,