[bootlin/training-materials] 0f0ac7: labs/sysdev-thirdparty: improve meson cross-file.txt

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 0f0ac7aec62c2eed793b9b45dc6c4c8f84444659
      https://github.com/bootlin/training-materials/commit/0f0ac7aec62c2eed793b9b45dc6c4c8f84444659
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2022-10-20 (Thu, 20 Oct 2022)

  Changed paths:
    M labs/sysdev-thirdparty/sysdev-thirdparty.tex

  Log Message:
  -----------
  labs/sysdev-thirdparty: improve meson cross-file.txt

Setting cpu to "cortex-a7" as in the slides

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