media: atomisp: Remove unused SOC_CAMERA, XENON_FLASH and FILE_INPUT subdev types

Nothing registers subdevs with the SOC_CAMERA, XENON_FLASH and FILE_INPUT
types, remove the code for these.

Link: https://lore.kernel.org/r/20230221145906.8113-8-hdegoede@redhat.com



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>