pixelstats: add ams_rate sysfs for ATOM of VendorAudioHardwareStatsReported

Bug: 239508478
Test: manually test passed

Signed-off-by: Roger Fang <rogerfang@google.com>
Change-Id: I33ef881cb6b48d7a53a4f0b61124a838cd16a189
diff --git a/pixelstats/service.cpp b/pixelstats/service.cpp
index a41d088..a1fe772 100644
--- a/pixelstats/service.cpp
+++ b/pixelstats/service.cpp
@@ -53,7 +53,8 @@
             UFS_ERR_PATH(dme_err_count),
             UFS_ERR_PATH(fatal_err_count),
             UFS_ERR_PATH(auto_hibern8_err_count)
-        }
+        },
+        .AmsRatePath = "/sys/devices/platform/audiometrics/ams_rate_read_once",
 };
 
 const struct UeventListener::UeventPaths ueventPaths = {