wifi: iwlwifi: mvm: don't count mgmt frames as MPDU

wifi: iwlwifi: mvm: don't count mgmt frames as MPDU

When handling TX_CMD notification, for mgmt frames tid is equal
to IWL_MAX_TID_COUNT, so with the current logic we'll count
that as MPDU, fix that.

Fixes: ec0d43d26f2c ("wifi: iwlwifi: mvm: Activate EMLSR based on traffic volume")
Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241229164246.80b119bb5d08.I31b1e8ba25cce15819225e5ac80332e4eaa20c13@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>