bananapim5pro: fix u-boot bad magic boot panic on edge branch

[LukaHummel]

Description

bananapim5pro: fix u-boot bad magic boot panic on edge branch

The current edge target tries to map to a non-existent mainline U-Boot configuration for the Banana Pi M5 Pro, resulting in an empty 0-byte DTB file compilation and an immediate FDT_ERR_BADMAGIC panic at boot. This PR adds an _edge suffix override to gracefully fall back to the validated ArmSoM Sige5 U-Boot configurations exclusively for edge builds.

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Checklist:

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• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

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