mac80211: minstrel_ht: update total packets counter in tx status path

Keep the update in one place and prepare for further rework

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20210127055735.78599-2-nbd@nbd.name


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