Export libnativewindow_headers from libui_headers

Test: Builds

Bug: 118715870
Change-Id: I849dad79f0063d3669d4467373b21b86ea876059
diff --git a/libs/ui/Android.bp b/libs/ui/Android.bp
index e521b61..755418e 100644
--- a/libs/ui/Android.bp
+++ b/libs/ui/Android.bp
@@ -167,6 +167,12 @@
             override_export_include_dirs: ["include_vndk"],
         },
     },
+    header_libs: [
+        "libnativewindow_headers",
+    ],
+    export_header_lib_headers: [
+        "libnativewindow_headers",
+    ],
 }
 
 subdirs = [