powerpc/pseries/msi: Use msi_domain_ops:: Msi_post_free()

Use the new msi_post_free() callback which is invoked after the interrupts
have been freed to tell the hypervisor about the shutdown.

This allows to remove the exposure of __msi_domain_free_irqs().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20221111122014.120489922@linutronix.de

arch/powerpc/platforms/pseries/msi.c

@@ -447,21 +447,18 @@ static void pseries_msi_ops_msi_free(struct irq_domain *domain,
  * RTAS can not disable one MSI at a time. It's all or nothing. Do it
  * at the end after all IRQs have been freed.
  */
-static void pseries_msi_domain_free_irqs(struct irq_domain *domain,
-					 struct device *dev)
+static void pseries_msi_post_free(struct irq_domain *domain, struct device *dev)
 {
 	if (WARN_ON_ONCE(!dev_is_pci(dev)))
 		return;
 
-	__msi_domain_free_irqs(domain, dev);
-
 	rtas_disable_msi(to_pci_dev(dev));
 }
 
 static struct msi_domain_ops pseries_pci_msi_domain_ops = {
 	.msi_prepare	= pseries_msi_ops_prepare,
 	.msi_free	= pseries_msi_ops_msi_free,
-	.domain_free_irqs = pseries_msi_domain_free_irqs,
+	.msi_post_free	= pseries_msi_post_free,
 };
 
 static void pseries_msi_shutdown(struct irq_data *d)