Patch merged into coreboot/master: cpu/x86: allow AP callbacks after MP init

the following patch was just integrated into master:
commit b21e362e93993a8879906cf3fa56586b84226920
Author: Aaron Durbin 
Date:   Wed Dec 7 00:32:19 2016 -0600

cpu/x86: allow AP callbacks after MP init

There are circumstances where the APs need to run a piece of
    code later in the boot flow. The current MP init just parks
    the APs after MP init is completed so there's not an opportunity
    to target running a piece of code on all the APs at a later time.
    Therefore, provide an option, PARALLEL_MP_AP_WORK, that allows
    the APs to perform callbacks.

BUG=chrome-os-partner:60657
    BRANCH=reef

Change-Id: I849ecfdd6641dd9424943e246317cd1996ef1ba6
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/17745
    Tested-by: build bot (Jenkins)
    Reviewed-by: Furquan Shaikh 
    Reviewed-by: Lijian Zhao

See https://review.coreboot.org/17745 for details.

-gerrit