cherry-pick request for "arm64/fpsimd: Avoid erroneous elide of user state reload"

Hey,

I got encouraged to send another email here from https://github.com/tpwrules/nixos-apple-silicon/issues/200.

"arm64/fpsimd: Avoid erroneous elide of user state reload" / https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... fixes a data corruption issue with dm-crypt on aarch64, reproducible on the mainline Linux kernel (not just asahi specific!).

This list has been included as Cc on this commit, but it'd be very nice to make sure this already lands in 6.9.2, due to its data corruption nature.

Thanks, Florian