media: atomisp: gc0310: Remove non working flip-controls

The gc0310_[v|h]_flip() functions are empty stubs, remove
the non working controls.

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