Patch merged into coreboot/master: nhlt: add api to override oem_id and oem_table_id of acpi_header_t

the following patch was just integrated into master:
commit 16ff85971f67d436d1375a86a3f5221b6ba9ee63
Author: Fang, Yang A 
Date:   Thu Jan 28 16:52:33 2016 -0800

nhlt: add api to override oem_id and oem_table_id of acpi_header_t

This patch added nhlt_soc_serialize_oem_overrides and
    nhlt_serilalize_oem_overrides to be able to override oem_id and
    oem_table_id.board file can pass specific string by calling
    nhlt_soc_serialize_oem_overrides

kernel use these two fields to construct a topology binary name
    if the designate file is not found a default dfw_sst.bin will be used
    it is optional.

BUG=chrome-os-partner:49570
    BRANCH=glados
    TEST=Build & Booted kunimitsu board. Verified that kernel
    can read new strings.

Change-Id: I00b64fb8bb63de601d3116e0b8941057c1efa230
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 374ce08b2d8a2f4e5dd7f51eacb505dbb77fd171
    Original-Change-Id: I03623c8ac81efb5a5ea3ec9c6cd604d2e9294022
    Original-Signed-off-by: Fang, Yang A 
    Original-Reviewed-on: https://chromium-review.googlesource.com/322860
    Original-Commit-Ready: Yang Fang 
    Original-Tested-by: Yang Fang 
    Original-Reviewed-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/13602
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/13602 for details.

-gerrit