extract-utils: Use LOCAL_VENDOR_FILE instead of LOCAL_PROPRIETARY_FILE

* Oreo expects VNDK compatible files to be listed as LOCAL_VENDOR_FILE,
  not LOCAL_PROPRIETARY_FILE.

Change-Id: Ia2384c4f3ab3a99b79df52c796c53dc25a0f4a88

build/tools/extract_utils.sh

@@ -358,7 +358,7 @@ function write_packages() {
             printf 'LOCAL_PRIVILEGED_MODULE := true\n'
         fi
         if [ "$VENDOR_PKG" = "true" ]; then
-            printf 'LOCAL_PROPRIETARY_MODULE := true\n'
+            printf 'LOCAL_VENDOR_MODULE := true\n'
         fi
         printf 'include $(BUILD_PREBUILT)\n\n'
     done