Linux kconfig has its own implementation of KCONFIG_WERROR now, so use that. This reduces our patch count by 2. Change-Id: I4f5f1f552e96f8ef7a4c5c0ab2ab7e2b6d798ceb Signed-off-by: Patrick Georgi <patrick@georgi.software> Reviewed-on: https://review.coreboot.org/c/coreboot/+/81223 Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>