Limit libui header exports for vendors

Bug: 77478180
Test: Build system
Change-Id: I3fd5732fdf2f3b62659146a8b3a82bffc22a0660
diff --git a/libs/ui/Android.bp b/libs/ui/Android.bp
index f71f814..6899f12 100644
--- a/libs/ui/Android.bp
+++ b/libs/ui/Android.bp
@@ -119,6 +119,11 @@
     name: "libui_headers",
     export_include_dirs: ["include"],
     vendor_available: true,
+    target: {
+        vendor: {
+            override_export_include_dirs: ["include_vndk"],
+        },
+    },
 }
 
 subdirs = [