[bootlin/training-materials] 4a6852: labs/sysdev-u-boot-*: use "sudo dmesg"

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 4a6852f8bf8a284884b24609b061f39652c627dd
      https://github.com/bootlin/training-materials/commit/4a6852f8bf8a284884b24609b061f39652c627dd
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2023-03-06 (Mon, 06 Mar 2023)

  Changed paths:
    M labs/sysdev-u-boot-bbb/sysdev-u-boot-bbb.tex
    M labs/sysdev-u-boot-stm32/sysdev-u-boot-stm32.tex

  Log Message:
  -----------
  labs/sysdev-u-boot-*: use "sudo dmesg"

Needed on Ubuntu 22.04

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