Patch merged into coreboot/master: arch/x86: always use _start as entry symbol for all stages

the following patch was just integrated into master:
commit 8198c678f7a7b1e3fbb44190903768397951e1f9
Author: Aaron Durbin 
Date:   Wed Mar 2 15:26:10 2016 -0600

arch/x86: always use _start as entry symbol for all stages

Instead of keeping track of all the combinations of entry points
    depending on the stage and other options just use _start. That way,
    there's no need to update the arch/header.ld for complicated cases
    as _start is always the entry point for a stage.

Change-Id: I7795a5ee1caba92ab533bdb8c3ad80294901a48b
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/13882
    Tested-by: build bot (Jenkins)
    Reviewed-by: Andrey Petrov

See https://review.coreboot.org/13882 for details.

-gerrit