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cmake: Normalize source paths via -ffile-prefix-map for consistent builds

Wei-Chia Su requested to merge ws/scmi-test-bug into main

Applied -ffile-prefix-map to all bare-metal toolchain files (GNU, Clang, ARMClang) to normalize source and build paths at compile time.

This change ensures:

  • Consistent and relative paths in debug info and FILE macros
  • Cleaner objdump output and improved compatibility with coverage tools

Signed-off-by: Wei-Chia Su Wei-Chia.Su@arm.com

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