wifi: rtw88: TX QOS Null data the same way as Null data

When filling out the TX descriptor, Null data frames are treated like
management frames, but QOS Null data frames are treated like normal
data frames. Somehow this causes a problem for the firmware.

When connected to a network in the 2.4 GHz band, wpa_supplicant (or
NetworkManager?) triggers a scan every five minutes. During these scans
mac80211 transmits many QOS Null frames in quick succession. Because
these frames are marked with IEEE80211_TX_CTL_REQ_TX_STATUS, rtw88
asks the firmware to report the TX ACK status for each of these frames.
Sometimes the firmware can't process the TX status requests quickly
enough, they add up, it only processes some of them, and then marks
every subsequent TX status report with the wrong number.

The symptom is that after a while the warning "failed to get tx report
from firmware" appears every five minutes.

This problem apparently happens only with the older RTL8723D, RTL8821A,
RTL8812A, and probably RTL8703B chips.

Treat QOS Null data frames the same way as Null data frames. This seems
to avoid the problem.

Tested with RTL8821AU, RTL8723DU, RTL8811CU, and RTL8812BU.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/2b53fb0d-b1ed-47b6-8caa-2bb9ae2acb80@gmail.com

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