wifi: rtw89: coex: Add Wi-Fi null data status version 7

The mechanism will use Wi-Fi null packet to stop the packets from
access point to avoid the interference to Bluetooth when switch
to Bluetooth slot. The report can check whether the null packet is
working as expected or not.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240423130502.32682-2-pkshih@realtek.com