PCI: mvebu: Include <linux/irqdomain.h> explicitly

pci-mvebu.c uses irq_domain_add_linear() and related interfaces but relies
on <linux/irqdomain.h> but doesn't include it directly; it relies on the
fact that <linux/of_irq.h> includes it.

Include <linux/irqdomain.h> directly to remove this implicit dependency.

Link: https://lore.kernel.org/r/20221031153954.1163623-4-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

drivers/pci/controller/pci-mvebu.c

@@ -13,6 +13,7 @@
 #include <linux/delay.h>
 #include <linux/gpio.h>
 #include <linux/init.h>
+#include <linux/irqdomain.h>
 #include <linux/mbus.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>