Patch merged into coreboot/master: build system: actually provide revision information in defconfig

the following patch was just integrated into master:
commit a91402fc1ee341fca6bec6df76960f68e8b0f8ce
Author: Patrick Georgi 
Date:   Fri Nov 27 12:36:28 2015 +0100

build system: actually provide revision information in defconfig

The config file added to CBFS is the short version created by defconfig.
    The build system tried to add a header describing the version for quite
    a while now, but failed because it wrote to the file, then had kconfig
    overwrite it with the config data.

While at it, rely on build.h and its version information instead of
    calling git manually.

Change-Id: I5e4d6c857594a55432c05bf1480973fc950f4d4a
    Signed-off-by: Patrick Georgi 
    Reviewed-on: https://review.coreboot.org/12558
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/12558 for details.

-gerrit