colibri_vf: usb gadget: toradex pid is now set generically

remove now unused CONFIG_TRDX_PID_XXX

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>