PCI: rcar-host: Silence 'set affinity failed' warning

Use MSI_FLAG_NO_AFFINITY, which keeps .irq_set_affinity() unset and allows
migrate_one_irq() to exit right away, without warnings like this:

  IRQ...: set affinity failed(-22)

Remove the .irq_set_affinity() implementation that is no longer needed.

Link: https://lore.kernel.org/r/20240723132958.41320-11-marek.vasut+renesas@mailbox.org
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

Author: Marek Vasut

drivers/pci/controller/pcie-rcar-host.c

@@ -658,11 +658,6 @@ static void rcar_msi_irq_unmask(struct irq_data *d)
 	spin_unlock_irqrestore(&msi->mask_lock, flags);
 }
 
-static int rcar_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
-{
-	return -EINVAL;
-}
-
 static void rcar_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 {
 	struct rcar_msi *msi = irq_data_get_irq_chip_data(data);
@@ -678,7 +673,6 @@ static struct irq_chip rcar_msi_bottom_chip = {
 	.irq_ack		= rcar_msi_irq_ack,
 	.irq_mask		= rcar_msi_irq_mask,
 	.irq_unmask		= rcar_msi_irq_unmask,
-	.irq_set_affinity 	= rcar_msi_set_affinity,
 	.irq_compose_msi_msg	= rcar_compose_msi_msg,
 };
 
@@ -725,8 +719,8 @@ static const struct irq_domain_ops rcar_msi_domain_ops = {
 };
 
 static struct msi_domain_info rcar_msi_info = {
-	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
-		   MSI_FLAG_MULTI_PCI_MSI),
+	.flags	= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+		  MSI_FLAG_NO_AFFINITY | MSI_FLAG_MULTI_PCI_MSI,
 	.chip	= &rcar_msi_top_chip,
 };