Enable rust backend

Enable rust EVS HAL backend and add its empty implementation that
returns binder::StatusCode::UNKNOWN_ERROR for all API except deprecated
ultrasonic API.

Fix: 319475162
Test: Build android.hardware.automotive.evs-aidl-rust-service and
      manually run it on cf_x86_64_auto lunch target.
Flag: EXEMPT HAL interface change
Change-Id: Ib9a1ee5fb224c114f57b6b6dca21d7b1cee005f0
diff --git a/automotive/evs/aidl/Android.bp b/automotive/evs/aidl/Android.bp
index dfb15c6..5b2f82f 100644
--- a/automotive/evs/aidl/Android.bp
+++ b/automotive/evs/aidl/Android.bp
@@ -44,6 +44,9 @@
         ndk: {
             min_sdk_version: "29",
         },
+        rust: {
+            enabled: true,
+        },
     },
     versions_with_info: [
         {