Staging: rtl8188eu: Fix sparse warning cast to restricted __le16

This patch fixes the following sparse warnings:
drivers/staging/rtl8188eu/core/rtw_wlan_util.c:1627:25: warning: cast to restricted __le16
by changing the annotations in the struct declaration.
Signed-off-by: NMonam Agarwal <monamagarwal123@gmail.com>
Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/include/wifi.h

@@ -694,7 +694,7 @@ struct WMM_para_element {
 
 struct ADDBA_request {
 	unsigned char	dialog_token;
-	unsigned short	BA_para_set;
+	__le16		BA_para_set;
 	unsigned short	BA_timeout_value;
 	unsigned short	BA_starting_seqctrl;
 } __packed;