ath10k: Revert "ath10k: add cleanup in ath10k_sta_state()"

This reverts commit 334f5b61.

This caused ath10k_snoc on Qualcomm MSM8998, SDM845 and QCS404 platforms to
trigger an assert in the firmware:

err_qdi.c:456:EF:wlan_process:1:cmnos_thread.c:3900:Asserted in wlan_vdev.c:_wlan_vdev_up:3219

Revert the offending commit for now.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath10k/mac.c

@@ -6639,12 +6639,8 @@ static int ath10k_sta_state(struct ieee80211_hw *hw,
 
 		spin_unlock_bh(&ar->data_lock);
 
-		if (!sta->tdls) {
-			ath10k_peer_delete(ar, arvif->vdev_id, sta->addr);
-			ath10k_mac_dec_num_stations(arvif, sta);
-			kfree(arsta->tx_stats);
+		if (!sta->tdls)
 			goto exit;
-		}
 
 		ret = ath10k_wmi_update_fw_tdls_state(ar, arvif->vdev_id,
 						      WMI_TDLS_ENABLE_ACTIVE);