contexthub: Enable rust bindings

To unblock writing IContextHub clients in rust

Change-Id: I0c0631b54f36faf69730e9005b03c92cd7bf3b3e
diff --git a/contexthub/aidl/Android.bp b/contexthub/aidl/Android.bp
index a865445..7a0a93b 100644
--- a/contexthub/aidl/Android.bp
+++ b/contexthub/aidl/Android.bp
@@ -34,6 +34,9 @@
         ndk: {
             apps_enabled: false,
         },
+        rust: {
+            enabled: true,
+        },
     },
     versions_with_info: [
         {