Enhance the TF-A build system to support board-specific build parameters
through TFA_EXTRA_ARGS mechanism.
Changes:
- Add TFA_EXTRA_ARGS variable support for board-specific parameters
- Implement proper string-to-list conversion for make argument expansion
This allows individual board configurations to specify platform-specific
TF-A build parameters without modifying the core TF-A build logic.
Signed-off-by: Appana Durga Kedareswara rao <appana.durga.kedareswara.rao@amd.com>
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