DRAFT: Port bcmmip from OpenBSD
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Authored by jim.chen.1827_gmail.com on Fri, Aug 21, 4:57 PM.

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Summary

The BCM2712 chip used on the Raspberry Pi 5 provides a device for handling MSI-X interrupts, which is used by the pcie bus that the RP1 sits on top of. In order to handle the interrupts raised by the RP1 and its subdevices, we port the bcmmip driver from OpenBSD