Create a skeleton Rust VHAL.

This is to prove that rust VHAL can be built and can run. The
skeleton Rust VHAL will return UNKNOWN_ERROR for all APIs.

Test: m android.hardware.automotive.vehicle-V3-rust-service
Manually replace VHAL on emulator with Selinux policy manually
updated to allow rust VHAL.
Bug: 320320087

Change-Id: I7d2dab392bf2ef982001df10c9b602c5c75888f7
diff --git a/automotive/vehicle/Android.bp b/automotive/vehicle/Android.bp
index 3549519..e614937 100644
--- a/automotive/vehicle/Android.bp
+++ b/automotive/vehicle/Android.bp
@@ -25,3 +25,11 @@
         "android.hardware.automotive.vehicle.property-V3-ndk",
     ],
 }
+
+rust_defaults {
+    name: "VehicleHalInterfaceRustDefaults",
+    rustlibs: [
+        "android.hardware.automotive.vehicle-V3-rust",
+        "android.hardware.automotive.vehicle.property-V3-rust",
+    ],
+}