Remove the now unused atomisp_css_enable_raw_binning() function.

Link: https://lore.kernel.org/r/20230221145906.8113-6-hdegoede@redhat.comReviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>