[Hotword] Implement IsHotwordHardwareAvailable() using device types.

ash/system/chromeos/audio/audio_detailed_view.cc

Index: ash/system/chromeos/audio/audio_detailed_view.cc
diff --git a/ash/system/chromeos/audio/audio_detailed_view.cc b/ash/system/chromeos/audio/audio_detailed_view.cc
index 9865774133b1a5cfa9ce2af2f70c69cad079ac1f..1dce1182cb4b07da180a6f480807b62c0c23fd71 100644
--- a/ash/system/chromeos/audio/audio_detailed_view.cc
+++ b/ash/system/chromeos/audio/audio_detailed_view.cc
@@ -118,8 +118,9 @@ void AudioDetailedView::UpdateAudioDevices() {
   chromeos::AudioDeviceList devices;
   CrasAudioHandler::Get()->GetAudioDevices(&devices);
   for (size_t i = 0; i < devices.size(); ++i) {
-    // Don't display keyboard mic.
-    if (devices[i].type == chromeos::AUDIO_TYPE_KEYBOARD_MIC)
+    // Don't display keyboard mic or aokr type.
+    if (devices[i].type == chromeos::AUDIO_TYPE_KEYBOARD_MIC ||
+        devices[i].type == chromeos::AUDIO_TYPE_AOKR)
       continue;
     if (devices[i].is_input)
       input_devices_.push_back(devices[i]);