media: atomisp: Change atomisp_enum_framesizes() too small cut off from 2/3th to 5/8th

Change atomisp_enum_framesizes() cut off for too small resolutions
from 2/3th to 5/8th this results in more resolutions being available
with some sensors.

E.g. this allows using 800x600 with a 1280x960 sensor.

Link: https://lore.kernel.org/r/20230619105212.303653-4-hdegoede@redhat.com



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