media: atomisp: rx: Removed #if defined(ISP2401) to make driver generic

The conflicts of variable declarations were resolved through previous
commits so the #if defined(ISP2401) can be removed.

Link: https://lore.kernel.org/r/20230713100231.308923-11-hpa@redhat.com



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