Patch merged into coreboot/master: arch/x86: Add option to disable default mmap_boot implementation

the following patch was just integrated into master:
commit 6a622311e477d2ac387dc6bb2b9f0f287b149531
Author: Alexandru Gagniuc 
Date:   Tue Oct 27 10:27:30 2015 -0700

arch/x86: Add option to disable default mmap_boot implementation

On certain platforms, the boot media is either not memory-mapped, or
    not mapped at the top of 4G. This makes the default mmap_boot
    implementation unsuitable. Add an option to allow such platforms to
    define their own mapping implementation.

Change-Id: I8293126fd9cc1fd3d75072f7811e659765348e4a
    Signed-off-by: Alexandru Gagniuc 
    Reviewed-on: https://review.coreboot.org/13319
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See https://review.coreboot.org/13319 for details.

-gerrit