AIDL: disable Rust explicitly

Now that it's enabled by default.

Because this uses custom parcelables.

Bug: 321267339
Test: m
Change-Id: I3d42fc11aa9f770e455d0fee8317a691b0dd926e

common/networkstackclient/Android.bp

diff --git a/common/networkstackclient/Android.bp b/common/networkstackclient/Android.bp
index 060f0da..2d327a4 100644
--- a/common/networkstackclient/Android.bp
+++ b/common/networkstackclient/Android.bp
@@ -47,6 +47,9 @@
         cpp: {
             enabled: false,
         },
+        rust: {
+            enabled: false,
+        },
     },
 
     visibility: [
@@ -159,6 +162,9 @@
         cpp: {
             enabled: false,
         },
+        rust: {
+            enabled: false,
+        },
     },
     imports: ["ipmemorystore-aidl-interfaces-V10"],
     // TODO: have tethering depend on networkstack-client and set visibility to private