iwlwifi: fix the ALIVE notification layout

The ucode_major and ucode_minor were swapped. This has
no practical consequences since those fields are not used.
Same goes for umac_major and umac_minor which were only
printed under certain debug flags.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>