media: staging: media: atomisp: Replace if else clause with a ternary

Use the ternary operator for conditional variable assignment in
create_host_video_pipeline().

Signed-off-by: Martiros Shakhzadyan <vrzh@vrzh.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>