i40e/base: add commands for NVM update

i40e/base: add commands for NVM update

Add a new GetStatus command so that the NVM update tool can query
the current status instead of doing fake write requests to probe for
readiness.
Add a facility to run AQ commands through the nvmupdate utility in order
to allow the update tools to interact with the FW and do special
commands needed for updates and configuration changes.
Add a facility to recover the result of a previously run AQ command.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
Tested-by: Huilong Xu <huilongx.xu@intel.com>