[L] Change in coreboot[main]: mb/lattepanda: Add support for LattePanda Mu

[KunYi Chen (Code Review)]

Attention is currently required from: Felix Held, KunYi Chen, Nicholas Chin, Nicholas Sudsgaard.

Hello Felix Held, Nicholas Chin, Nicholas Sudsgaard, Paul Menzel, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/83719?usp=email

to look at the new patch set (#19).

Change subject: mb/lattepanda: Add support for LattePanda Mu
......................................................................

mb/lattepanda: Add support for LattePanda Mu

Add initial support for the LattePanda Mu board, which features:
  - Intel Alder Lake-N N100 processor
  - 8GB LPDDR5 memory
  - 64GB eMMC storage
  - SO-DIMM 260-pin connector for function expansion

This commit includes:
  - Basic board configuration
  - Memory initialization
  - Essential I/O setup
  - Used UEFITool NE alpha 68 (Nov 4 2023) to extract data.vbt file
    from original BIOS
     - Download BIOS: https://github.com/LattePandaTeam/LattePanda-Mu
       under Softwares/BIOS/DFLT/LP-BS-S70NC1R200-SR-A.bin.zip

Test Environment:
  - Carrier Board: Lite
  - Payload: mrchromebox/edk2
  - Edk2 Version: uefipayload_202309

Test result
Passed:
  - Windows 11 boot from eMMC
  - Install Ubuntu 24.04 on NVMe SSD
  - Ubuntu 24.04 boot from NVMe SSD
  - USB 3.0/2.0 functionality
  - HDMI output
  - Realtek Ethernet

Known Issues:
  - S3 sleep mode non-functional
  - Power-on after shutdown requires power removal
  - Windows 11 BSOD occurs with NVMe SSD installed
  - SuperIO UART not detected in Windows 11
  - NVMe SSD not working on Windows 11, except when:
    - KDNet Debugging enabled on NIC during boot
    - SSD becomes functional in this scenario

Change-Id: I79696bdd837a221860b32f54629212c3346dca66
Signed-off-by: KunYi Chen 
---
A configs/config.lattepanda_mu
A src/mainboard/lattepanda/Kconfig
A src/mainboard/lattepanda/Kconfig.name
A src/mainboard/lattepanda/mu/Kconfig
A src/mainboard/lattepanda/mu/Kconfig.name
A src/mainboard/lattepanda/mu/Makefile.mk
A src/mainboard/lattepanda/mu/board_info.txt
A src/mainboard/lattepanda/mu/bootblock.c
A src/mainboard/lattepanda/mu/data.vbt
A src/mainboard/lattepanda/mu/devicetree.cb
A src/mainboard/lattepanda/mu/dsdt.asl
A src/mainboard/lattepanda/mu/early_gpio.c
A src/mainboard/lattepanda/mu/gpio.c
A src/mainboard/lattepanda/mu/include/baseboard/gpio.h
A src/mainboard/lattepanda/mu/include/baseboard/variants.h
A src/mainboard/lattepanda/mu/mainboard.c
A src/mainboard/lattepanda/mu/memory.c
A src/mainboard/lattepanda/mu/ramstage.c
A src/mainboard/lattepanda/mu/romstage_fsp_params.c
A src/mainboard/lattepanda/mu/spd/Makefile.mk
A src/mainboard/lattepanda/mu/spd/mu_lp5_16gb.spd.hex
A src/mainboard/lattepanda/mu/spd/mu_lp5_8gb.spd.hex
22 files changed, 861 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/19/83719/19