misc: usb251xb: Support 8/16 bit device tree values

The device tree binding [1] specify the vendor-id, product-id, device-id
and language-id as 16 bit values and the linux driver reads the boost-up
value as 8 bit value.

[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/usb/usb251xb.txt



Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Reviewed-by: Marek Vasut <marex@denx.de>