kvm_vgic_sync_hwstate is only called with IRQ being disabled.
There is thus no need to call spin_lock_irqsave/restore in
vgic_fold_lr_state and vgic_prune_ap_list.

This patch replace them with the non irq-safe version.
Signed-off-by: NJia He <jia.he@hxt-semitech.com>
Acked-by: NChristoffer Dall <christoffer.dall@arm.com>
[maz: commit message tidy-up]
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>