fix(cachyllama): use portable ARM build

Avoid the CPU_ALL_VARIANTS SME matrix on ARM, where the Linux and Darwin backend toolchains fail to compile CachyLLaMA. Keep the existing variant build for x86 and use the fully linked fallback build for ARM.

Assisted-by: Codex:gpt-5 [systematic-debugging]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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