[L] Change in coreboot[main]: mb/dell: Add Latitude E6430 (Ivy Bridge)

[Nicholas Chin (Code Review)]

Attention is currently required from: Martin L Roth, Paul Menzel.

Hello Martin L Roth, Paul Menzel, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/77444?usp=email

to look at the new patch set (#10).

Change subject: mb/dell: Add Latitude E6430 (Ivy Bridge)
......................................................................

mb/dell: Add Latitude E6430 (Ivy Bridge)

Mainboard is QAL80/LA-7781P (UMA). The version with an Nvidia dGPU model
was not tested. This is based on the autoport output with some manual
tweaks. The flash is 8MiB + 4MiB, and can be easily accessed by removing
the keyboard. It can also be internally flashed by sending a command to
the EC, which causes the EC to pull the FDO pin low and the firmware to
skip setting up any chipset based write protections [1]. The EC is the
SMSC MEC5055, which seems to be compatible with the existing MEC5035
code.

Working:
- Libgfxinit
- USB EHCI debug (left side usb port is HCD index 2, middle port on the
  right side is HCD index 1)
- Keyboard
- Touchpad/trackpoint
- ExpressCard
- Audio
- Ethernet
- SD card reader
- mPCIe WiFi
- SeaBIOS 1.16.2
- edk2 (MrChromebox' fork, uefipayload_202306)
- Internal flashing using dell-flash-unlock

Not working:
- S3 suspend: Possibly EC related, DRAM power is getting cut when
  entering S3
- Physical wireless switch - this triggers an SMI handler in the vendor
  firmware which sends commands to the EC to enable/disable wireless
  devices, and has not been reimplemented
- Battery reporting - needs ACPI code for the EC
- Brightness hotkeys - probably EC related

Unknown/untested:
- Dock
- eSATA
- TPM
- dGPU on non-UMA model
- Bluetooth module (not included on my system)

[1] https://gitlab.com/nic3-14159/dell-flash-unlock

Change-Id: I93c6622fc5da1d0d61a5b2c197ac7227d9525908
Signed-off-by: Nicholas Chin 
---
A src/mainboard/dell/snb_ivb_latitude/Kconfig
A src/mainboard/dell/snb_ivb_latitude/Kconfig.name
A src/mainboard/dell/snb_ivb_latitude/Makefile.mk
A src/mainboard/dell/snb_ivb_latitude/acpi/ec.asl
A src/mainboard/dell/snb_ivb_latitude/acpi/platform.asl
A src/mainboard/dell/snb_ivb_latitude/acpi/superio.asl
A src/mainboard/dell/snb_ivb_latitude/acpi_tables.c
A src/mainboard/dell/snb_ivb_latitude/board_info.txt
A src/mainboard/dell/snb_ivb_latitude/cmos.default
A src/mainboard/dell/snb_ivb_latitude/cmos.layout
A src/mainboard/dell/snb_ivb_latitude/devicetree.cb
A src/mainboard/dell/snb_ivb_latitude/dsdt.asl
A src/mainboard/dell/snb_ivb_latitude/gma-mainboard.ads
A src/mainboard/dell/snb_ivb_latitude/mainboard.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/data.vbt
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/early_init.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/gpio.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/hda_verb.c
A src/mainboard/dell/snb_ivb_latitude/variants/e6430/overridetree.cb
19 files changed, 605 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/77444/10