instrument fingerprint settings

instrument visibility on all fingerprint views
  rename and delete action
  add fingerprint action is implicit in flow

Bug: 22951001
Change-Id: I53f048f479e24754972b801598d5da393ba9d716

src/com/android/settings/fingerprint/FingerprintEnrollFindSensor.java

@@ -21,6 +21,7 @@ import android.content.Intent;
 import android.hardware.fingerprint.FingerprintManager;
 import android.os.Bundle;
 
+import com.android.internal.logging.MetricsLogger;
 import com.android.settings.ChooseLockSettingsHelper;
 import com.android.settings.R;
 
@@ -105,4 +106,9 @@ public class FingerprintEnrollFindSensor extends FingerprintEnrollBase {
             finish();
         }
     }
+
+    @Override
+    protected int getMetricsCategory() {
+        return MetricsLogger.FINGERPRINT_FIND_SENSOR;
+    }
 }