net/iavf: support RSS for GRE tunnel packet
net/iavf: support RSS for GRE tunnel packet

Support AVF RSS for inner header of GRE tunnel packet. It supports
RSS based on fields inner IP src + dst address and TCP/UDP src + dst
port.

Signed-off-by: Wenjun Wu <f2c8f8c385402f4722593bcff277b2cd6b66f35b@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

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