Use -Werror in frameworks/av/media

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I9d129155dbed8ead9d4c5786d321227e6b8b3bd4
diff --git a/media/libeffects/config/Android.bp b/media/libeffects/config/Android.bp
index 4398a91..3e88c7c 100644
--- a/media/libeffects/config/Android.bp
+++ b/media/libeffects/config/Android.bp
@@ -5,6 +5,11 @@
 
     srcs: ["src/EffectsConfig.cpp"],
 
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+
     shared_libs: [
         "liblog",
         "libtinyxml2",