Use -Werror in frameworks/native/services

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I391c6ae2c791b8bad013efea1b05e7f3caf2a2b5
diff --git a/services/schedulerservice/Android.bp b/services/schedulerservice/Android.bp
index ca91b8e..0227164 100644
--- a/services/schedulerservice/Android.bp
+++ b/services/schedulerservice/Android.bp
@@ -3,6 +3,7 @@
     srcs: [
         "SchedulingPolicyService.cpp",
     ],
+    cflags: ["-Wall", "-Werror"],
     shared_libs: [
         "libhidlbase",
         "libhidltransport",