linux-postmarketos-allwinner: upgrade to 6.17.5_git20251026

Arnav Singhrequested to merge
allwinner-6.17.5 into master

Also switch to building with LLVM, per postmarketos#123

Tested PinePhone 1.2b - both cameras (Megapixels), call audio (earpiece, speaker, headphones), SMS, wifi, mobile data, USB networking, suspend, receiving calls in suspend.

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