colibri_vf: Add pinmux entries for GPIOs

Inorder to use the pins as GPIO, apart from setting the alt-function,
pinmuxing need to be done, this patch adds pinmux entries of
few GPIOs.

Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>