Use -Werror in system/libhidl

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I1b1307bac3df32d4ebabdca427c86731f59af584
diff --git a/adapter/Android.bp b/adapter/Android.bp
index 9bedb7b..a814e10 100644
--- a/adapter/Android.bp
+++ b/adapter/Android.bp
@@ -14,6 +14,7 @@
 
 cc_library_shared {
     name: "libhidladapter",
+    defaults: ["libhidl-defaults"],
     vendor_available: true,
     srcs: [
         "HidlBinderAdapter.cpp"