zd1211rw: adding 083a:e503 as a ZD1211B device

Hans Pontar reported success on the sourceforge zd1211-devs mailing list.
The device is branded "Arcor Easy Stick A 50 WLAN" (device manufactured
by SMC for a German ISP - SMC model name: WN4501H-LF-IR). General
information and Windows driver are available under (German only):

http://www.arcor.de/hilfe/neu/index.php?sid=&aktion=anzeigen&rubrik=004018140&id=487

Device details:

USB-IDs: Vendor: 0x083A Device: 0xE503
Chip ID: zd1211b chip 083a:e503 v4810 high 00-1d-19 AL2230S_RF pa0 g--N-
Signed-off-by: NHin-Tak Leung <htl10@users.sourceforge.net>
Tested-by: NHans Pontar <pontar@gmx.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_usb.c

@@ -67,6 +67,7 @@ static struct usb_device_id usb_ids[] = {
 	{ USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
 	{ USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
 	{ USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
+	{ USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
 	{ USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
 	{ USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
 	{ USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },