virtio: Reduce boilerplate for device driver module definitions

Rather than have every device register itself for both virtio_pci and
virtio_mmio, provide a VIRTIO_DRIVER_MODULE wrapper to declare b

virtio: Reduce boilerplate for device driver module definitions

Rather than have every device register itself for both virtio_pci and
virtio_mmio, provide a VIRTIO_DRIVER_MODULE wrapper to declare both,
merge VIRTIO_SIMPLE_PNPTABLE with VIRTIO_SIMPLE_PNPINFO and make the
latter register for both buses. This also has the benefit of abstracting
away the available transports and their names.

Reviewed by: bryanv
Differential Revision: https://reviews.freebsd.org/D28073

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virtio: Handle possible failure of virtio_finalize_features()

Try to standardize how drivers negotiate feature and the
function names

Reviewed by: grehan (mentor)
Differential Revision: https://rev

virtio: Handle possible failure of virtio_finalize_features()

Try to standardize how drivers negotiate feature and the
function names

Reviewed by: grehan (mentor)
Differential Revision: https://reviews.freebsd.org/D27930

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virtio_console: Add modern (V1) support

Reviewed by: grehan (mentor)
Differential Revision: https://reviews.freebsd.org/D27901