media: atomisp: use clamp() in ia_css_eed1_8_encode()

When it needs to get a value within a certain interval, using clamp()
makes the code easier to understand than min(max()).

Signed-off-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20240830011752.603433-2-lizetao1@huawei.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>