On arm64 (where INTRNG is enabled), the interrupts have to be mapped with ACPI_BUS_MAP_INTR() before adding them as resources to devices.
The earlier code did the mapping before calling acpi_set_resource(), which bypassed code that checked for PCI link interrupts.
To fix this, move the call to map interrupts into acpi_set_resource() and that requires additional work to lookup interrupt properties.
The changes here are to:
* extend acpi_lookup_irq_handler() to lookup an irq in the ACPI resources
* create a helper function acpi_map_intr() which uses the updated acpi_lookup_irq_handler() to look up an irq, and then map it with ACPI_BUS_MAP_INTR()
* use acpi_map_intr() in acpi_pcib_route_interrupt() to map pci link interrupts.
With these changes, we can drop the ifdefs in acpi_resource.c, and
we can also drop the call for mapping interrupts in generic_timer.c