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doc: Add section describing platform_init_hook

Mahmoud Elsabbagh requested to merge plat-init-doc into main

This change adds a new section to architecture_support.md documenting the purpose, usage, and constraints of the platform_init_hook(). The section explains its role in performing early platform-specific initialization prior to framework and module setup.

It includes:

  • Purpose and Usage
  • Limitations on memory, API usage, and Ordering
  • Expected failure behavior
  • A valid usage code example
  • An anti-pattern code example demonstrating incorrect usage

Signed-off-by: Mahmoud Elsabbagh mahmoud.elsabbagh@arm.com

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