Disable ensure_secure_kernelparams.sh to always enable serial console.

This is factory-branch-only change.

BUG=chrome-os-partner:38520
TEST=none

Change-Id: If2b57dd7304c950b7e80e64776c7e098da63159c
Reviewed-on: https://chromium-review.googlesource.com/262836
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
diff --git a/scripts/image_signing/ensure_secure_kernelparams.sh b/scripts/image_signing/ensure_secure_kernelparams.sh
index 2b13cff..0dfd841 100755
--- a/scripts/image_signing/ensure_secure_kernelparams.sh
+++ b/scripts/image_signing/ensure_secure_kernelparams.sh
@@ -59,6 +59,9 @@
 }
 
 main() {
+    echo "Sorry, $0 is disabled on this factory branch."
+    exit 0
+
     # We want to catch all the discrepancies, not just the first one.
     # So, any time we find one, we set testfail=1 and continue.
     # When finished we will use testfail to determine our exit value.