[L] Change in coreboot[master]: mb/asrock/b75m-itx: Add Sandy/Ivy Bridge board B75M-ITX

[Kevin Keijzer (Code Review)]

Attention is currently required from: Felix Singer, Angel Pons, Arthur Heymans, Nicholas Chin, Fabian Groffen, Elyes Haouas.

Kevin Keijzer has uploaded a new patch set (#4) to the change originally created by Fabian Groffen. ( https://review.coreboot.org/c/coreboot/+/73097 )

Change subject: mb/asrock/b75m-itx: Add Sandy/Ivy Bridge board B75M-ITX
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mb/asrock/b75m-itx: Add Sandy/Ivy Bridge board B75M-ITX

This board is based off b75pro3-m, which is very similar.  Compared to
it, it just lacks a COM1 header, and the secondary ASMedia SATA3
controller.

Tested with:
CPUs:
- Core i5-3330
- Core i5-3470
- Core i7-3770

RAM:
- single bank 4GB CL11
- two banks 4+4GB CL9
- two banks 8+8GB CL10

OS:
- Gentoo Linux LiveUSB, KDE desktop (Linux 5.15.72)

Working:
- GRUB2 payload with embedded default config for boot from USB, disk
- UEFI EDK2 payload
- Intel ME stripped
- Native raminit
- Integrated graphics with libgfxinit (HDMI, DVI and VGA)
- (boot from) SATA2, SATA3, ports
- Rear USB 2 and 3 ports (supports boot)
- Internal USB 2.0 ports
- Realtek GbE NIC
- 2.0 channel audio via lineout jack output
- ACPI (power button triggers OS event)

Untested:
- Internal USB 2.0 ports
- eSATA port
- 7.1 channel audio

Signed-off-by: Fabian Groffen 
Change-Id: Ia6a6eb3e922920f4afbcb7828cd2b779b9caebcb
---
A src/mainboard/asrock/b75m-itx/Kconfig
A src/mainboard/asrock/b75m-itx/Kconfig.name
A src/mainboard/asrock/b75m-itx/Makefile.inc
A src/mainboard/asrock/b75m-itx/acpi/ec.asl
A src/mainboard/asrock/b75m-itx/acpi/platform.asl
A src/mainboard/asrock/b75m-itx/acpi/superio.asl
A src/mainboard/asrock/b75m-itx/board_info.txt
A src/mainboard/asrock/b75m-itx/devicetree.cb
A src/mainboard/asrock/b75m-itx/dsdt.asl
A src/mainboard/asrock/b75m-itx/early_init.c
A src/mainboard/asrock/b75m-itx/gma-mainboard.ads
A src/mainboard/asrock/b75m-itx/gpio.c
A src/mainboard/asrock/b75m-itx/hda_verb.c
A src/mainboard/asrock/b75m-itx/mainboard.c
14 files changed, 538 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/97/73097/4