staging: rtl8723au: Fix sparse warnings

Some struct fields in wifi.h are meant to be __le16 but were declared as
unsigned short. This was reported by sparse:

rtw_wlan_util.c:538:24: warning: cast to restricted __le16
rtw_wlan_util.c:1544:29: warning: cast to restricted __le16
rtw_wlan_util.c:1546:25: warning: cast to restricted __le16

This patch updates the types of the fields in `AC_param` and
`ADDBA_request` structs to be consistent with relevant structs in
include/linux/ieee80211.h.

Signed-off-by: Krzysztof Konopko <[e-mail]>
Signed-off-by: Jes Sorensen <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8723au/include/wifi.h

···
 ------------------------------------------------------------------------------*/
 
 struct AC_param {
-	unsigned char		ACI_AIFSN;
-	unsigned char		CW;
-	unsigned short	TXOP_limit;
+	u8			ACI_AIFSN;
+	u8			CW;
+	__le16			TXOP_limit;
 }  __packed;
 
 struct WMM_para_element {
···
 }  __packed;
 
 struct ADDBA_request {
-	unsigned char		dialog_token;
-	unsigned short	BA_para_set;
-	unsigned short	BA_timeout_value;
-	unsigned short	BA_starting_seqctrl;
+	u8		dialog_token;
+	__le16		BA_para_set;
+	__le16		BA_timeout_value;
+	__le16		BA_starting_seqctrl;
 }  __packed;