Create a skeleton Rust audio control HAL

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

Bug: 319474244
Flag: EXEMPT HAL interface change
Test: m android.hardware.automotive.audiocontrol-V4-rust-service

Change-Id: I64916b3eaa8410e0b137b5b34578710899f91324
diff --git a/automotive/audiocontrol/aidl/rust_impl/audiocontrol-rust-service.rc b/automotive/audiocontrol/aidl/rust_impl/audiocontrol-rust-service.rc
new file mode 100644
index 0000000..88d180d
--- /dev/null
+++ b/automotive/audiocontrol/aidl/rust_impl/audiocontrol-rust-service.rc
@@ -0,0 +1,4 @@
+service vendor.audiocontrol-default /vendor/bin/hw/android.hardware.automotive.audiocontrol-service.example
+    class hal
+    user audioserver
+    group system