arm64: split ARM64_PTR_AUTH option to userspace and kernel

Daniel Kiss daniel.kiss at
Fri Dec 18 06:56:30 EST 2020

As discussed the A-key left enabled, this makes the patch simpler too.
arch/arm64/crypto/poly1305-core.S_shipped contains PACISP/AUTISP
instructions but this code is called while the preeption is disabled,
therefore it won't cause any trouble.

- dropped the keychange/enablement for the kernel keys.

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