Revert "util/lint/kconfig_lint: change warning levels and text"

This reverts commit dfdb0733a6a71b11d15006dafc13841e84fab7cd.

Change-Id: I91bf5e42f4ac241f544742ce161bae651f9f9947
Reviewed-on: https://review.coreboot.org/16868
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
1 file changed