Patch merged into coreboot/master: kconfig_lint: Exclude some Kconfig symbols from unused symbol checks

the following patch was just integrated into master:
commit 6bfbf1c66fe321da5f7c6c8f815ea3d75107ed09
Author: Martin Roth 
Date:   Mon Jan 25 16:12:49 2016 -0700

kconfig_lint: Exclude some Kconfig symbols from unused symbol checks

The configuration that coreboot uses for setting selected symbols
    typically involves a structure like this:
    config BLEH_SPECIFIC_OPTIONS
    def_bool y
    select SYMBOL

This leads to an an extra kconfig symbol BLEH_SPECIFIC_OPTIONS
    that is never referenced by anything else, generating a warning.

Since this is currently the construct that coreboot uses, filter it
    out of the warnings for now.

Change-Id: I85a95e4c4e8469870c7f219f2a92955819845573
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/13457
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/13457 for details.

-gerrit