arm64: KVM: Implement fpsimd save/restore

Implement the fpsimd save restore, keeping the lazy part in
assembler (as returning to C would be overkill).

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
(cherry picked from commit c13d1683df16db16c91372177ca10c31677b5ed5)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
6 files changed