Revert "Disable ensure_secure_kernelparams.sh to always enable serial console."

This reverts commit 82a9df88b4483de86f2f31a25d80926b2e93632f.

Signer bot uses specific vboot reference code so disabling
ensure_secure_kernelparms.sh here does not really help.

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

Change-Id: I55f0f255cb6de6c00147ac005668d7189a5c229a
Reviewed-on: https://chromium-review.googlesource.com/262856
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 0dfd841..2b13cff 100755
--- a/scripts/image_signing/ensure_secure_kernelparams.sh
+++ b/scripts/image_signing/ensure_secure_kernelparams.sh
@@ -59,9 +59,6 @@
 }
 
 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.