[bootlin/training-materials] 4d5c4d: embedded-linux: update QEMU bootloader lab

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 4d5c4dd850031f424e7d32116c44175bfa970ef4
      https://github.com/bootlin/training-materials/commit/4d5c4dd850031f424e7d32116c44175bfa970ef4
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2023-01-11 (Wed, 11 Jan 2023)

  Changed paths:
    M lab-data/embedded-linux-qemu/bootloader/data/u-boot
    R lab-data/embedded-linux-qemu/bootloader/data/vexpress_flags_reset.patch
    M labs/sysdev-u-boot-qemu/sysdev-u-boot-qemu.tex

  Log Message:
  -----------
  embedded-linux: update QEMU bootloader lab

To have a recent version of U-Boot that compiles fine with our gcc-11 toolchain.
Errors were reported with U-Boot 2020.04.

Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>