Add preupload hook to encourage submission to AOSP am: 89330a04ac

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/1458338

Change-Id: Ife13a2b3aaf7ed32f46add821abd8b328b18b131
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 75ed57c..374db91 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -3,3 +3,6 @@
 
 [Builtin Hooks Options]
 rustfmt = --config-path=rustfmt.toml
+
+[Hook Scripts]
+aosp_hook = ${REPO_ROOT}/frameworks/base/tools/aosp/aosp_sha.sh ${PREUPLOAD_COMMIT} "."