rtw89: Add RX counters of VHT MCS-10/11 to debugfs

8852AE can receive packets with VHT MCS10/11, and we want to know we have
received this kind of packets, so show the counter of VHT MCS10/11 in
debugfs, like:

TP TX: 1 [1] Mbps (lv: 1), RX: 420 [422] Mbps (lv: 4)
Beacon: 19
Avg packet length: TX=102, RX=3081
RX count:
   Legacy: [0, 0, 0, 0]
     OFDM: [0, 0, 0, 0, 0, 0, 0, 0]
     HT 0: [0, 0, 0, 0, 0, 0, 0, 0]
     HT 1: [0, 0, 0, 0, 0, 0, 0, 0]
  VHT 1SS: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0][0, 0]
  VHT 2SS: [0, 0, 0, 0, 0, 0, 0, 4, 624, 4818][29913, 556]
   HE 1SS: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
   HE 2ss: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
TX rate [0]: VHT 2SS MCS-9 SGI	(hw_rate=0x119)	==> agg_wait=1 (3500)
RX rate [0]: VHT 2SS MCS-10 SGI	(hw_rate=0x11a)
RSSI: -30 dBm (raw=161, prev=165)

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220103013623.17052-2-pkshih@realtek.com