media: ov08x40: Select mode based on mipi lane count

Use the v4l2_find_nearest_size_conditional() helper to figure out which
drive-supported lane can be used on a given system.
Also avoid exposing duplicate frame sizes to userspace when multiple
modes share the same resolution but differ in lane count.

Signed-off-by: Jason Chen <jason.z.chen@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>