patch review: MMIO cmdline

[Emile `iMil' Heitor <imil%home.imil.net@localhost>]

Hi,

This patch adds support for command-line MMIO device information.
At least QEMU and Firecracker pass MMIO virtual devices mapping
through the kernel command line when ACPI is either disabled or
unavailable.

This driver is based on Colin Percival's FreeBSD virtio_mmio_cmdline.c:
https://github.com/freebsd/freebsd-src/blob/main/sys/dev/virtio/mmio/virtio_mmio_cmdline.c

The patch: https://imil.net/NetBSD/mmio_cmdline.patch

Thanks,

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Emile `iMil' Heitor <imil@{home.imil.net,NetBSD.org}> | https://imil.net