Patch merged into coreboot/master: kconfig_lint: Add warning if tristate type is used in coreboot

the following patch was just integrated into master:
commit 08ee1cfafc2464cbeccaf3ede553b4c4e9b66367
Author: Martin Roth 
Date:   Mon Jan 25 16:39:32 2016 -0700

kconfig_lint: Add warning if tristate type is used in coreboot

Although there's no reason we COULDN'T use tristate types, we haven't
    up to this point.  If there's a good reason to use them in the future,
    this check can be removed.

Change-Id: I5f1903341f522bc957e394bc0fd288ba1adab431
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/13460
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/13460 for details.

-gerrit