LibBSD | INTRNG: Add support for INTRNG on aarch64 (!133)

[Chris Johns (@chris)]

Chris Johns commented on a discussion: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/133#note_151115


The OFW is being passed a `NULL`:

```
#2  nexus_alloc_resource (bus=<optimized out>, child=0x77d7b0, type=<optimized out>, rid=0x63be3c, start=<optimized out>, end=18446744073709551615, count=1, flags=2) at ../../rtemsbsd/rtems/rtems-kernel-nexus.c:248
248                                     rpic_xref = OF_xref_from_node(ofw_bus_get_node(intr_irq_root_dev));
(gdb) p intr_irq_root_dev
$1 = (device_t) 0x0
```

Looks like a check needs to be added for missing interrupt FDT nodes and an orderly exit.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/133#note_151115
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