media: v4l: fwnode: The CSI-2 clock is continuous if it's not non-continuous

The continuous clock flag was only set if there was a clock or data lanes.
This isn't needed as such a configuration is invalid to begin with. Always
set the continuous clock flag if the non-continuous property is not found.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>