video: fbdev: add missing USB-descriptor endianness conversions

Add the missing endianness conversions when printing the USB
device-descriptor idVendor, idProduct and bcdDevice fields during probe.

Signed-off-by: Johan Hovold <johan@kernel.org>
Cc: Steve Glendinning <steve.glendinning@shawell.net>
Cc: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>