usb: misc: usb3503: Add USB3503A to the compatible list

There are no software visible differences that I am aware of but in case
any are discovered allow the DTS to specify exactly which device is
present.
Signed-off-by: NMark Brown <broonie@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/usb3503.txt

 SMSC USB3503 High-Speed Hub Controller
 
 Required properties:
-- compatible: Should be "smsc,usb3503".
+- compatible: Should be "smsc,usb3503" or "smsc,usb3503a".
 - reg: Specifies the i2c slave address, it should be 0x08.
 - connect-gpios: Should specify GPIO for connect.
 - disabled-ports: Should specify the ports unused.

drivers/usb/misc/usb3503.c

@@ -272,6 +272,7 @@ MODULE_DEVICE_TABLE(i2c, usb3503_id);
 #ifdef CONFIG_OF
 static const struct of_device_id usb3503_of_match[] = {
 	{ .compatible = "smsc,usb3503", },
+	{ .compatible = "smsc,usb3503a", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, usb3503_of_match);