pipeline: rkisp1: Support media graph with separate CSI RX

The rkisp1 hardware supports both a CSI-2 input and a parallel input,
where the sensor is connected directly to the ISP. On RK3399, the CSI-2
receiver is internal, but on the i.MX8MP, the CSI-2 receiver is a
separate IP core, connected to the parallel input of the ISP, and gets
exposed to userspace as a V4L2 subdev. To prepare for this, handle an
optional CSI-2 receiver subdev in the pipeline.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>

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