KVM: arm/arm64: vgic_init: Cleanup reference to process_maintenance

One comment still mentioned process_maintenance operations after
commit af061499 ("KVM: arm/arm64: vgic: Get rid of unnecessary
process_maintenance operation")

Update the comment to point to vgic_fold_lr_state instead, which
is where maintenance interrupts are taken care of.
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

virt/kvm/arm/vgic/vgic-init.c

@@ -423,7 +423,7 @@ static irqreturn_t vgic_maintenance_handler(int irq, void *data)
 	 * We cannot rely on the vgic maintenance interrupt to be
 	 * delivered synchronously. This means we can only use it to
 	 * exit the VM, and we perform the handling of EOIed
-	 * interrupts on the exit path (see vgic_process_maintenance).
+	 * interrupts on the exit path (see vgic_fold_lr_state).
 	 */
 	return IRQ_HANDLED;
 }