There are efforts to replace Chrome EC with Zephyr. To ensure Chromebook specific Zephyr developments (that can eventually be built as part of a coreboot build just like Chrome EC now, and are built with coreboot-sdk) don't break with Zephyr's toolchain, add the toolchain to our builders so we can do some sanity checking. Change-Id: I645a298bc350ebe7651c08aea630bdc6b93856aa Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49986 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com>