prod_image_util.sh: Temporarily nobble removing unsigned kernel and GRUB

We would normally remove these for an official build so that the signed
versions can be uploaded later. However, we are not doing that signing
until we pass the shim review.

Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>
(cherry picked from commit 3f68400908c8ad61b7c83f3cad4af09c98d6267d)

build_library/prod_image_util.sh

@@ -182,6 +182,8 @@ EOF
 
   # Official builds will sign and upload these files later, so remove them to
   # prevent them from being uploaded now.
+  # TODO: Un-nobble this later when we have passed the shim review.
+  false && \
   if [[ ${COREOS_OFFICIAL:-0} -eq 1 ]]; then
     rm -v \
         "${BUILD_DIR}/${image_kernel}" \