media: atomisp: mt9m114: Fix fmt->code not getting set on try_fmt

Fix mt9m114_set_fmt() not setting format.format.code when called with
format.which == V4L2_SUBDEV_FORMAT_TRY.

This fixes atomisp failing to start streaming with the mt9m114 on
an Asus T100TA because of __media_pipeline_start() returning -EPIPE.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20241013154056.12532-5-hdegoede@redhat.com


Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>