pipeline: add SWX DMA instruction
pipeline: add SWX DMA instruction

The DMA instruction handles the bulk read transfer of one header from
the table entry action data. Typically used to generate headers, i.e.
headers that are not extracted from the input packet.

Signed-off-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>

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