linux-wandboard

iwlagn: show and store firmware build number

We currently display the build number only if debugging
is enabled, but it is really helpful so show it all the
time. Also store it so it can be retrieved later via
ethtool.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>