iwlwifi: mvm: fix endianity issues with Smart Fifo commands

iwlwifi: mvm: fix endianity issues with Smart Fifo commands

commit 86974bff066dd8b98be46d7c7d3aba89034f0833 upstream.

This code was broken on big endian systems. Sparse didn't
catch the bug since the firmware command was not tagged as
little endian.
Fix the bug for big endian systems and tag the field in the
firmware command to prevent such issues in the future.

Fixes: 1f3b0ff8ec ("iwlwifi: mvm: Add Smart FIFO support")
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>