net/ark: add device capabilities record
net/ark: add device capabilities record

Add a device capabilities record for supported features.
Certain variants require that PCIe read-requests be correctly
throttled. This is called "rqpacing" in Arkville, and has to do
with credit and flow control on certain Arkville implementations.

Signed-off-by: John Miller <8c3e694821b089e49385d637347abd0ef3d091ca@atomicrules.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk