iwlwifi: use 4k queue size for Bz A-step

There's a hardware bug in Bz A-step that can be worked
around by using 4k queue size, so do that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220304131517.10ea0e115d05.Idfb3706133bf3b15f1f68f1145e77e89947449d1@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>