net/netvsc: add Hyper-V network device

The driver supports Hyper-V networking directly like
virtio for KVM or vmxnet3 for VMware.

This code is based off of the FreeBSD driver. The file and variable

net/netvsc: add Hyper-V network device

The driver supports Hyper-V networking directly like
virtio for KVM or vmxnet3 for VMware.

This code is based off of the FreeBSD driver. The file and variable
names are kept the same to help with understanding (with most of the
BSD style warts removed).

This version supports the latest NetVSP 6.1 version and
older versions.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>

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