Revert "genirq/msi: Provide constants for PCI/IMS support"

This reverts commit e23d4192bf.

IMS (Interrupt Message Store) support appeared in v6.2, but there are no
users yet.

Remove it for now.  We can add it back when a user comes along.

Link: https://lore.kernel.org/r/20240410221307.2162676-8-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/irqdomain_defs.h

@@ -25,7 +25,6 @@ enum irq_domain_bus_token {
 	DOMAIN_BUS_PCI_DEVICE_MSIX,
 	DOMAIN_BUS_DMAR,
 	DOMAIN_BUS_AMDVI,
-	DOMAIN_BUS_PCI_DEVICE_IMS,
 	DOMAIN_BUS_DEVICE_MSI,
 	DOMAIN_BUS_WIRED_TO_MSI,
 };

include/linux/msi.h

@@ -573,8 +573,6 @@ enum {
 	MSI_FLAG_MSIX_CONTIGUOUS	= (1 << 19),
 	/* PCI/MSI-X vectors can be dynamically allocated/freed post MSI-X enable */
 	MSI_FLAG_PCI_MSIX_ALLOC_DYN	= (1 << 20),
-	/* Support for PCI/IMS */
-	MSI_FLAG_PCI_IMS		= (1 << 21),
 };
 
 /**

include/linux/msi_api.h

@@ -15,7 +15,6 @@ struct device;
  */
 enum msi_domain_ids {
 	MSI_DEFAULT_DOMAIN,
-	MSI_SECONDARY_DOMAIN,
 	MSI_MAX_DEVICE_IRQDOMAINS,
 };