gs101: add audio uevent to report mic status for pixelstats

  ACTION=change
  DEVPATH=/devices/virtual/amcs/amcs
  MIC_BREAK_STATUS=1

Bug: 174994440
Test: Manually test passed
Signed-off-by: Roger Fang <rogerfang@google.com>
Change-Id: I2a478167960ea9b2e8cbe732e030fa38757204d7
diff --git a/pixelstats/service.cpp b/pixelstats/service.cpp
index 5695971..2bc19b8 100644
--- a/pixelstats/service.cpp
+++ b/pixelstats/service.cpp
@@ -40,10 +40,12 @@
     .CodecPath =     "/sys/devices/platform/audiometrics/codec_state",
 };
 
+const char *const kAudioUevent = "/devices/virtual/amcs/amcs";
+
 int main() {
     LOG(INFO) << "starting PixelStats";
 
-    UeventListener ueventListener("");
+    UeventListener ueventListener(kAudioUevent);
     std::thread listenThread(&UeventListener::ListenForever, &ueventListener);
     listenThread.detach();