net/i40e/base: support NVM feature flags

net/i40e/base: support NVM feature flags

Extend NVM Update API to support reporting of features
available for the tools.

This change is needed by NVM Update to determine if driver
supports changing NVM layout from structured to flat.

Signed-off-by: Piotr Pietruszewski <piotr.pietruszewski@intel.com>
Signed-off-by: Krzysztof Galazka <krzysztof.galazka@intel.com>
Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>