archive_hwqual: copy image directly

There is no need to use image_to_usb.sh to copy the test image to
another directory.

BUG=chromium:353282
TEST=trybot run passes

Change-Id: I96467af8bc8bf8118ee3c2cbf7193f5b40d5f56a
Reviewed-on: https://chromium-review.googlesource.com/190580
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
diff --git a/archive_hwqual b/archive_hwqual
index 6a58a01..bdd9b18 100755
--- a/archive_hwqual
+++ b/archive_hwqual
@@ -67,10 +67,9 @@
 
   cd "${TMP}"
 
-  echo "Formatting rootfs as a USB image..."
-  "${script_dir}/image_to_usb.sh" --from="${FLAGS_image_dir}" \
-    --image="${FLAGS_image}" \
-    --to="tarball/${FLAGS_output_tag}/chromeos-hwqual-usb.img"
+  echo "Copying image..."
+  cp "${FLAGS_image_dir}/${FLAGS_image}" \
+      "tarball/${FLAGS_output_tag}/chromeos-hwqual-usb.img"
 
   echo "Inserting documentation and autotest to tarball..."
   ln -s \