AIDL: disable Rust explicitly

Now that it's enabled by default, because this
doesn't compile in Rust.

Bug: 321267339
Test: m
Change-Id: I01e0af965827944ba2b4b168a6e8d6c4cf81cfff
diff --git a/biometrics/face/aidl/Android.bp b/biometrics/face/aidl/Android.bp
index 7adf402..fadcde7 100644
--- a/biometrics/face/aidl/Android.bp
+++ b/biometrics/face/aidl/Android.bp
@@ -29,6 +29,9 @@
         cpp: {
             enabled: false,
         },
+        rust: {
+            enabled: false,
+        },
         ndk: {
             additional_shared_libraries: [
                 "libnativewindow",