RLT8821: Add Edimax EW-7811UAC discovery.

Add the identifier for the Edimax EW-7811UAC USB network adapter to
the identifier table.

os_dep/linux/usb_intf.c

@@ -286,6 +286,7 @@ static struct usb_device_id rtw_usb_id_tbl[] ={
 	/*=== Customer ID ===*/
 	{USB_DEVICE(0x7392, 0xA811),.driver_info = RTL8821}, /* Edimax - Edimax */
 	{USB_DEVICE(0x7392, 0xA812),.driver_info = RTL8821}, /* Edimax - EW-7811UTC */
+	{USB_DEVICE(0x7392, 0xA813),.driver_info = RTL8821}, /* Edimax - EW-7811UAC */
 	{USB_DEVICE(0x2001, 0x3314),.driver_info = RTL8821}, /* D-Link - Cameo */
 	{USB_DEVICE(0x0846, 0x9052),.driver_info = RTL8821}, /* Netgear - A6100 */
 	{USB_DEVICE(0x2019, 0xAB32),.driver_info = RTL8821}, /* Planex - GW-450S */