common/mlx5: add DevX virtq commands

common/mlx5: add DevX virtq commands

Virtio emulation offload allows SW to offload the I/O operations of a
virtio virtqueue, using the device, allowing an improved performance
for its users.
While supplying all the relevant Virtqueue information (type, size,
memory location, doorbell information, etc.). The device can then
offload the I/O operation of this queue, according to its device type
characteristics.

Some of the virtio features can be supported according to the device
capability, for example, TSO and checksum.

Add virtio queue create, modify and query DevX commands.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>