media: atomisp: Allow camera_mipi_info to be NULL

camera_mipi_info is an atomisp / atomisp_gmin_platform specific struct,
allow mipi_info pointers to be NULL.

This is a preparation patch for making atomisp work with
standard v4l2 sensor drivers.

Link: https://lore.kernel.org/r/20230518153733.195306-9-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>