Use -Werror in frameworks/native/libs/sensor

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: Ie48b1a09ef38598038a251296b9caa87bc74cbb3
diff --git a/libs/sensor/tests/Android.bp b/libs/sensor/tests/Android.bp
index 9d530fc..9fd84bc 100644
--- a/libs/sensor/tests/Android.bp
+++ b/libs/sensor/tests/Android.bp
@@ -17,6 +17,8 @@
 
     clang: true,
 
+    cflags: ["-Wall", "-Werror"],
+
     srcs: [
         "Sensor_test.cpp",
     ],