ath11k: clear DCM max constellation tx value

According to 11ax spec. draft 4.0. DCM Max Constellation Tx data
field should be set to "Reserved" for an AP, therefore bit is
cleared.
Signed-off-by: Muna Sinada <msinada@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1590707417-29672-1-git-send-email-msinada@codeaurora.org

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

@@ -3578,6 +3578,8 @@ static int ath11k_mac_copy_he_cap(struct ath11k *ar,
 
 		switch (i) {
 		case NL80211_IFTYPE_AP:
+			he_cap_elem->phy_cap_info[3] &=
+				~IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_TX_MASK;
 			he_cap_elem->phy_cap_info[9] |=
 				IEEE80211_HE_PHY_CAP9_RX_1024_QAM_LESS_THAN_242_TONE_RU;
 			break;