Only use byte register access in legacy virtio pci

Some simulators don't implement arbitrary sized memory access to the
virtio PCI registers. Follow Linux and use single byte accesses to read
and wr

Only use byte register access in legacy virtio pci

Some simulators don't implement arbitrary sized memory access to the
virtio PCI registers. Follow Linux and use single byte accesses to read
and write to these registers.

Reviewed by: bryanv, emaste (previous version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31424

(cherry picked from commit 89c085b8993d7d1e7b137f99fa6df94c37c3a68a)

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virtio-modern: fix PCI common read/write functions on big endian targets

Virtio modern has the common data organized in little endian, but
on powerpc64 BE it was reading and writing in the wrong end

virtio-modern: fix PCI common read/write functions on big endian targets

Virtio modern has the common data organized in little endian, but
on powerpc64 BE it was reading and writing in the wrong endian.

Submitted by: Leonardo Bianconi <[email protected]>
Reviewed by: bryanv, alfredo
Sponsored by: Eldorado Research Institute (eldorado.org.br)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D28947

(cherry picked from commit fb53b42e36a9745d0a33821175a962c7a15eeeaa)

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