Add -Wthread-safety in libmediautils

Bug: 268360578
Test: m
Change-Id: I2532cf19e6e56e5c36c1c31c6326971377bf1415
diff --git a/media/utils/Android.bp b/media/utils/Android.bp
index 698752f..7abb0b6 100644
--- a/media/utils/Android.bp
+++ b/media/utils/Android.bp
@@ -103,6 +103,13 @@
 
     logtags: ["EventLogTags.logtags"],
 
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+        "-Wthread-safety",
+    ],
+
     export_shared_lib_headers: [
         "libpermission",
     ],