[L] Change in coreboot[main]: mainboard: Add MSI MS-7788

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Change subject: mainboard: Add MSI MS-7788
......................................................................

mainboard: Add MSI MS-7788

HACKS:
* The SSKPD read hangs the boot, not sure why
  * I disabled it and everything seems to work...
* I changed Sandybridge `chipset.cb` because I was
  getting warnings in my logs about leftover
  static devices
  * This is definitely not the correct way to do
    things, so I want to know what the right
    course of action actually _is_
  * Do I leave the warning be?
  * Or is there something else I can do?

NOTES:
* Been running this BIOS for a while: it's working
  well for the parts I've tested
* MSI h61m-p31/w8
* Winbond 25Q64FVSIG
* Fintek F71868A
  * I haven't hooked this up because there is no
    code specifically for this chip, I might
    experiment with the F71869AD code in the
    future, but right now it's working fine
    without BIOS superio support

Working:
* PCIe graphics
* Integrated graphics (libgfxinit)
* USB (all ports)
* Ethernet
* All SATA ports
* Serial output

Yet-to-be-thoroughly-tested:
* Suspend states

Untested:
* PS/2
* PCIe x1 lane

Signed-off-by: mrhh69 
Change-Id: Ia7830fcc7552e9734ec7c57e508a6a77f689e5b0
---
A src/mainboard/msi/ms7788/Kconfig
A src/mainboard/msi/ms7788/Kconfig.name
A src/mainboard/msi/ms7788/Makefile.mk
A src/mainboard/msi/ms7788/acpi/ec.asl
A src/mainboard/msi/ms7788/acpi/platform.asl
A src/mainboard/msi/ms7788/acpi/superio.asl
A src/mainboard/msi/ms7788/board_info.txt
A src/mainboard/msi/ms7788/data.vbt
A src/mainboard/msi/ms7788/devicetree.cb
A src/mainboard/msi/ms7788/dsdt.asl
A src/mainboard/msi/ms7788/gma-mainboard.ads
A src/mainboard/msi/ms7788/gpio.c
A src/mainboard/msi/ms7788/hda_verb.c
M src/northbridge/intel/sandybridge/chipset.cb
M src/northbridge/intel/sandybridge/romstage.c
15 files changed, 363 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/79/79979/6