arm64: Use FEAT_SSBS as a Spectre-V4 workaround
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Authored by andrew on Sep 12 2023, 3:28 PM.

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arm64

Summary

FEAT_SSBS adds a flag to that allows the hardware to load or store
speculatively in a way that could lead to a cache timing side channel.
We have been implicitly supporting this flag in the kernel by clearing
it on boot, but should allow the user to set it in the same way as the
existing workaround.