Add libavfutil

The library has common utilities for various components in AVF.

Bug: 295168844
Test: atest libavfutil.test
Change-Id: If24309f480d0704c6bcba9c193a4caf578ee9d51
diff --git a/libs/avfutil/TEST_MAPPING b/libs/avfutil/TEST_MAPPING
new file mode 100644
index 0000000..73bcc20
--- /dev/null
+++ b/libs/avfutil/TEST_MAPPING
@@ -0,0 +1,9 @@
+// When adding or removing tests here, don't forget to amend _all_modules list in
+// wireless/android/busytown/ath_config/configs/prod/avf/tests.gcl
+{
+  "avf-presubmit" : [
+    {
+      "name" : "libavfutil.test"
+    }
+  ]
+}