KVM: arm64: Fix comment on barrier in kvm_psci_vcpu_on()

The barrier is there for power_off rather than power_state.
Probably typo in commit 358b28f0 ("arm/arm64: KVM: Allow
a VCPU to fully reset itself").
Signed-off-by: NFuad Tabba <tabba@google.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211208193257.667613-3-tabba@google.com

arch/arm64/kvm/psci.c

@@ -109,7 +109,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
 
 	/*
 	 * Make sure the reset request is observed if the change to
-	 * power_state is observed.
+	 * power_off is observed.
 	 */
 	smp_wmb();