ath11k: set WMI_PEER_40MHZ while peer assoc for 6 GHz

When station connect to AP of 6 GHz with 40 MHz bandwidth, the TX is
always stay 20 MHz, it is because the flag WMI_PEER_40MHZ is not set
while peer assoc. Add the flag if remote peer is 40 MHz bandwidth.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03003-QCAHSPSWPL_V1_V2_SILICONZ_LITE-2

Fixes: c3a7d7eb ("ath11k: add 6 GHz params in peer assoc command")
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220119034211.28622-1-quic_wgong@quicinc.com

drivers/net/wireless/ath/ath11k/mac.c

@@ -2319,6 +2319,9 @@ static void ath11k_peer_assoc_h_he_6ghz(struct ath11k *ar,
 	if (!arg->he_flag || band != NL80211_BAND_6GHZ || !sta->he_6ghz_capa.capa)
 		return;
 
+	if (sta->bandwidth == IEEE80211_STA_RX_BW_40)
+		arg->bw_40 = true;
+
 	if (sta->bandwidth == IEEE80211_STA_RX_BW_80)
 		arg->bw_80 = true;