bhyve/pci_emul.c: Setup fixed PCI irq mappings for hotpluggable slots

[bnovkov]

Summary

Tweak init_pci to set up irq mappings for all pins in a given
hotpluggable slot.
This makes it possible to emit ACPI interrupt routing entries (PRT)
for hotpluggable slots, which is a prerequisite for ACPI-based
device hotplugging.

[markj]

usr.sbin/bhyve/pci_emul.c

1675

These can be declared in the loop, for (int pin = 0; pin < 4; ...) { struct intxinfo *ii; ... }

1687

Indentation is wrong here.

[bnovkov]

Address @markj 's comments.