i40e: generic filter control
i40e: generic filter control

Only provide empty handler.
It can be completed to support filter features on fortville.

Signed-off-by: Jingjing Wu <64d28b617c3b4840f5ded1bfa611cba7fadfe5c7@intel.com>
[Thomas: remove unused empty functions]

msune/dpdk,venkynv/dpdk-mirror,msune/dpdk,tsphillips/dpdk-fork,msune/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,mixja/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,msune/dpdk,tsphillips/dpdk-fork,mixja/dpdk,mixja/dpdk,tsphillips/dpdk-fork,mixja/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk