Draft: Support load-time CPU-feature-based relocations

Closed 4lDO2 requested to merge 4lDO2/bootloader:alternative into master

This does add quite some complexity, but the kernel impl is written in such a way IIRC, that as long as the new kernel args are passed (as zero), the kernel will assume the default settings are in place.

Can theoretically be merged before kernel!203 (closed)

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