mac80211: rearrange struct txq_info for fewer holes

We can slightly decrease the size of struct txq_info by
rearranging some fields for fewer holes, 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.20210618133832.1bf019a1fe2e.Ib54622b8d6dc1a9a7dc484e573c073119450538b@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>