[L] Change in coreboot[main]: mb/asus/p8x7x-series: Add SABERTOOTH Z77 as a variant

[Keith Hui (Code Review)]

Attention is currently required from: Keith Hui.

Hello build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/85768?usp=email

to look at the new patch set (#3).

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Change subject: mb/asus/p8x7x-series: Add SABERTOOTH Z77 as a variant
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mb/asus/p8x7x-series: Add SABERTOOTH Z77 as a variant

Copied from p8z77-v variant, then adjusted overridetree, GPIO, GMA
HDA verbs and USB port config based on boardview and vendor firmware
image.

It builds, but not hardware tested.

Unlike most other variants, this one allows use of MRC raminit, if
for testing.

It has no serial port, but a debug port allows access to LPC bus,
minus LDRQ# signal.

Change-Id: I1c26e751a224491c5aa1ce1035c55955ef0ee83c
Signed-off-by: Keith Hui 
---
A Documentation/mainboard/asus/sabertooth_z77.md
M Documentation/mainboard/index.md
M src/mainboard/asus/p8x7x-series/Kconfig
M src/mainboard/asus/p8x7x-series/Kconfig.name
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/board_info.txt
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/cmos.default
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/cmos.layout
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/data.vbt
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/early_init.c
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/gma-mainboard.ads
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/gpio.c
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/hda_verb.c
A src/mainboard/asus/p8x7x-series/variants/sabertooth_z77/overridetree.cb
13 files changed, 676 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/68/85768/3