ixgbe: extend .info_get() with stored versions

Add functions reading inactive versions from the inactive flash
bank.

Print stored versions for the content present in the inactive bank.
If there's pending update the versions reflect the ones which
are going to be loaded after reload. If there's no pending update
both running and stored are the same, which means there won't
be any NVM change on reload.

Co-developed-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
Co-developed-by: Piotr Kwapulinski <piotr.kwapulinski@intel.com>
Signed-off-by: Piotr Kwapulinski <piotr.kwapulinski@intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>