Update TEST_MAPPING files

Some of the rust_tests were not part of either avf-presubmit or
avf-postsubmit. This change puts them into avf-presubmit

Test: atest --test-mapping packages/modules/Virtualization:avf-presubmit
Change-Id: Iac0cd0efeb08eee15eeb8dd1bd621d705ca24248
diff --git a/libs/capabilities/TEST_MAPPING b/libs/capabilities/TEST_MAPPING
new file mode 100644
index 0000000..568a771
--- /dev/null
+++ b/libs/capabilities/TEST_MAPPING
@@ -0,0 +1,10 @@
+{
+  "avf-presubmit" : [
+    {
+      "name" : "libcap_rust.test"
+    },
+    {
+      "name" : "libcap_bindgen_test"
+    }
+  ]
+}