media: atomisp: fix videobuf2 Kconfig depenendency

media: atomisp: fix videobuf2 Kconfig depenendency

The recent conversion missed the Kconfig bit, so it can now
end up in a link error on randconfig builds:

ld.lld: error: undefined symbol: vb2_vmalloc_memops
>>> referenced by atomisp_fops.c
>>>               drivers/staging/media/atomisp/pci/atomisp_fops.o:(atomisp_open) in archive vmlinux.a

Link: https://lore.kernel.org/r/20230104082212.3770415-1-arnd@kernel.org
Fixes: cb48ae89be3b ("media: atomisp: Convert to videobuf2")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>