greybus: fix vendor and product matching

Fix vendor and product matching by matching on the 32-bit Ara vendor and
product ids.

Remove the "fake" 16-bit vendor and product ids and export the Ara ids
using the "vendor" and "product" interface attributes instead.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>