automotive: Add Rust backend to the vhal AIDL

This enables us to write a vhal service in Rust.

Test: Verified with a custom replacement of the DefaultVehicleHal and ran in cuttlefish
Change-Id: I53601e1a10cee75877e76ae04f7837e7d1a20ebd

automotive/vehicle/aidl/Android.bp

@@ -41,6 +41,9 @@ aidl_interface {
                 "com.android.car.framework",
             ],
         },
+        rust: {
+            enabled: true,
+        },
     },
     versions_with_info: [
         {

automotive/vehicle/aidl_property/Android.bp

@@ -42,6 +42,9 @@ aidl_interface {
                 "com.android.car.framework",
             ],
         },
+        rust: {
+            enabled: true,
+        },
     },
     versions_with_info: [
         {