Add the Arm SPE interrupt to acpidump

To support the Arm Statistical Profiling Extension (SPE) ACPI 6.3 added
a place to hold the SPE interrupt. Add to acpidump to show when printing
the Arm Generic Interrupt data.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit c363da4ae81b319223ae06adb96c5ecd9260b45e)