Add top-level Android.bp with test ownership.

Since this is a manually added Android.bp, also ensure we run bpfmt.

Change-Id: I1a38fec072622f684ddd9ddab92e983d5f2db531
Bug: 339424309
Test: treehugger
diff --git a/crates/Android.bp b/crates/Android.bp
new file mode 100644
index 0000000..2c6aa16
--- /dev/null
+++ b/crates/Android.bp
@@ -0,0 +1,3 @@
+package {
+    default_team: "trendy_team_android_rust",
+}