USB: Adding YC Cable USB Serial device to pl2303

This simply adds the "YC Cable" as a vendor and its pl2303-based
USB<->Serial adapter as a product.  This particular adapter is sold by
Radio Shack.  I've done limited testing on a few different systems with
no issues.

Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/pl2303.h b/drivers/usb/serial/pl2303.h
index 226997d..f1f67bd 100644
--- a/drivers/usb/serial/pl2303.h
+++ b/drivers/usb/serial/pl2303.h
@@ -112,3 +112,6 @@
 #define HL340_VENDOR_ID		0x4348
 #define HL340_PRODUCT_ID	0x5523
 
+/* Y.C. Cable U.S.A., Inc - USB to RS-232 */
+#define YCCABLE_VENDOR_ID	0x05ad
+#define YCCABLE_PRODUCT_ID	0x0fba