media: staging: imx-csi: move media_pipeline to video device

The imx-media driver has a single imx_media_device. Attaching the
media_pipeline to the imx_media_device prevents the execution of multiple
media pipelines on the device. This should be possible as long as the
media_pipelines don't use the same pads or pads that be configured while
the other media pipeline is streaming.

Move the media_pipeline to the imx_media_video_dev to be able to construct
media pipelines per imx capture device.

If different media pipelines in the media device conflict, the validation
will fail. Thus, the pipeline will fail to start and signal an error to
user space.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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