mac80211: minstrel_ht: add flag to indicate missing/inaccurate tx A-MPDU length

Some hardware (e.g. MediaTek MT7603) cannot report A-MPDU length in tx status
information. Add support for a flag to indicate that, to allow minstrel_ht
to use a fixed value in its internal calculation (which gives better results
than just defaulting to 1).

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/debugfs.c

@@ -218,6 +218,7 @@ static const char *hw_flag_names[] = {
 	FLAG(BUFF_MMPDU_TXQ),
 	FLAG(SUPPORTS_VHT_EXT_NSS_BW),
 	FLAG(STA_MMPDU_TXQ),
+	FLAG(TX_STATUS_NO_AMPDU_LEN),
 #undef FLAG
 };