media: atomisp: ov2722: Call atomisp_gmin_remove_subdev() on probe failure

Call atomisp_gmin_remove_subdev() on probe failure to properly free
the GPIOs and other resources acquired by the gmin_camera_platform_data()
call earlier.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>