ath11k: avoid WMM param truncation

In conf_tx() mac operation callback, we are truncating the tx
params cw_min and cw_max due to lower data type cast. so modified
the data type of cwmin and cwmax to avoid the trucation issue.
Signed-off-by: Karthikeyan Periyasamy <periyasa@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath11k/wmi.h

@@ -4501,8 +4501,8 @@ struct wmi_wmm_params {
 struct wmi_wmm_params_arg {
 	u8 acm;
 	u8 aifs;
-	u8 cwmin;
-	u8 cwmax;
+	u16 cwmin;
+	u16 cwmax;
 	u16 txop;
 	u8 no_ack;
 };