irqchip/gic-v5: Add ACPI IWB probing

irqchip/gic-v5: Add ACPI IWB probing

To probe an IWB in an ACPI based system it is required:

- to implement the IORT functions handling the IWB IORT node and create
  functions to retrieve IWB firmware information
- to augment the driver to match the DSDT ACPI "ARMH0003" device and
  retrieve the IWB wire and trigger mask from the GSI interrupt descriptor
  in the IWB msi_domain_ops.msi_translate() function

Make the required driver changes to enable IWB probing in ACPI systems.

The GICv5 GSI format requires special handling for IWB routed IRQs.

Add IWB GSI detection to the top level driver gic_v5_get_gsi_domain_id()
function so that the correct IRQ domain for a GSI can be detected by
parsing the GSI and check whether it is an IWB-backed IRQ or not.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260115-gicv5-host-acpi-v3-6-c13a9a150388@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>