dpdk/rss: add rte_flow rss support for ixgbe

dpdk/rss: add rte_flow rss support for ixgbe

ixgbe driver requires different configuration of RSS rte_flow
rule than i40e, with just one generic rule matching all traffic.

The generic rule configured by DeviceCreateRSSFlowGeneric() has pattern
equivalent to "pattern eth / end" in dpdk-testpmd syntax. The rule must
have rx queues configured. The rule hashes traffic to different queues
based on ipv4 and ipv6 hash types (ipv4 src dst / ipv6 src dst).
The hash key is 40 bytes long  symmetric hash key. ixgbe does not
support any other hash function than RTE_ETH_HASH_FUNCTION_DEFAULT.

The syntax in dpdk-testpmd for this rule with attributes:
	port index == 0
	used rx queue indices == 0 1 2 3
	<hash_key> == 6d5a symmetric hash key
is as follows:
"flow create 0 ingress pattern eth / end actions rss types ipv4 ipv6
end queues 0 1 2 3 end key <hash_key> key_len 40 func default / end"

Ticket: 7337