media: atomisp: Drop unused frame_status tracking

media: atomisp: Drop unused frame_status tracking

After removing the flash support frame_status now always is
ATOMISP_FRAME_STATUS_OK aka 0. Drop frame_status tracking.

This also means one less atomisp custom use for the vb2_buffer->reserved*
fields (all custom use of these fields should be removed).

While at it also remove the no longer used vf_frame pointer from
struct atomisp_sub_device.

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>