media: atomisp: Move pad linking to atomisp_register_device_nodes()

media: atomisp: Move pad linking to atomisp_register_device_nodes()

atomisp_register_device_nodes() already iterates over the ports/sensors
in a loop and that loop already does not include the TPG input.

So we can simply setup the CSI2-port <-> ISP and sensor <-> CSI2-port
mediactl-pad links there instead of repeating the loop in
atomisp_create_pads_links(), which atomisp_register_device_nodes()
used to call later on.

Link: https://lore.kernel.org/r/20230518153733.195306-8-hdegoede@redhat.com
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>