[bootlin/training-materials] 5c8344: common/sequence-stm32mp1.dia: improve diagram

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 5c83442692989b8e1ea062470fbd577acf621c8f
      https://github.com/bootlin/training-materials/commit/5c83442692989b8e1ea062470fbd577acf621c8f
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2023-02-01 (Wed, 01 Feb 2023)

  Changed paths:
    M common/sequence-stm32mp1.dia
    M slides/sysdev-bootloaders-sequence/sysdev-bootloaders-sequence.tex

  Log Message:
  -----------
  common/sequence-stm32mp1.dia: improve diagram

- To reflect what's happening better
- Source: https://wiki.st.com/stm32mpu/wiki/TF-A_overview

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