rtl8xxxu: Mark 8192eu device 0x0bda:0x818b as tested

Device reported as working fine, so tell the driver not to warn about
it being untested.
Reported-by: NAex Aey <aexaey@gmail.com>
Signed-off-by: NJes Sorensen <Jes.Sorensen@gmail.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c

@@ -6000,6 +6000,7 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
 		case 0x8176:
 		case 0x8178:
 		case 0x817f:
+		case 0x818b:
 			untested = 0;
 			break;
 		}