Patch merged into coreboot/master: Makefile: Fix KCONFIG_AUTOHEADER dependencies

the following patch was just integrated into master:
commit 0d869ede7faf161df2424466988cef471e989086
Author: Stefan Reinauer 
Date:   Fri Jul 17 13:31:16 2015 -0700

Makefile: Fix KCONFIG_AUTOHEADER dependencies

This makes the Makefile more robust when changing the file name
    or changing the .config outside of make *config

Change-Id: Ifc013cc3ef899a7846742a961261ac50bc67e27b
    Signed-off-by: Stefan Reinauer 
    Reviewed-on: http://review.coreboot.org/10970
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi 
    Reviewed-by: Paul Menzel

See http://review.coreboot.org/10970 for details.

-gerrit