usb: misc: uss720: point pp->dev to usbdev->dev

This avoids a "fix this legacy no-device port driver" warning from
parport_announce_port in drivers/parport/share.c. The parport driver now
requires a pointer to the device struct.

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Acked-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Link: https://lore.kernel.org/r/20240326150723.99939-2-alexhenrie24@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>