extract_utils: Add preprocessed: true to all presigned apps

Change-Id: I4b20c9ef7d496f4d179acfbe3baf899d4a7796d8
diff --git a/extract_utils.sh b/extract_utils.sh
index 3ba2675..77dd774 100644
--- a/extract_utils.sh
+++ b/extract_utils.sh
@@ -529,6 +529,7 @@
             for ARG in "${ARGS[@]}"; do
                 if [ "$ARG" = "PRESIGNED" ]; then
                     USE_PLATFORM_CERTIFICATE="false"
+                    printf '\tpreprocessed: true,\n'
                     printf '\tpresigned: true,\n'
                 elif [[ "$ARG" =~ "OVERRIDES" ]]; then
                     OVERRIDEPKG=${ARG#*=}