[bootlin/training-materials] 5fe7ed: yocto: lab6: fix MACHINE settings for kirkstone

[Luca Ceresoli]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 5fe7ed19e2063855c8c8b38672b361e2d55eb659
      https://github.com/bootlin/training-materials/commit/5fe7ed19e2063855c8c8b38672b361e2d55eb659
  Author: Luca Ceresoli <luca.ceresoli at bootlin.com>
  Date:   2022-07-21 (Thu, 21 Jul 2022)

  Changed paths:
    M labs/yocto-custom-machine/yocto-custom-machine.tex

  Log Message:
  -----------
  yocto: lab6: fix MACHINE settings for kirkstone

This change was missing when the kirkstone upgrade has been committed.

Fixes: 2d91eed53553 ("yocto: lab6: upgrade to kirkstone (BBB boards)")
Signed-off-by: Luca Ceresoli <luca.ceresoli at bootlin.com>