Patch merged into coreboot/master: Change #ifdef and #if defined CONFIG_ bools to #if IS_ENABLED()

the following patch was just integrated into master:
commit c4e49f62621429a363b092d1a6df11d2cf380465
Author: Martin Roth 
Date:   Sat Jul 11 13:42:54 2015 -0600

Change #ifdef and #if defined CONFIG_ bools to #if IS_ENABLED()

Kconfigs symbols of type bool are always defined, and can be tested with
    the IS_ENABLED() macro.

symbol type except string.

Change-Id: Ic4ba79f519ee2a53d39c10859bbfa9c32015b19d
    Signed-off-by: Martin Roth 
    Reviewed-on: http://review.coreboot.org/10885
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10885 for details.

-gerrit