pipeline: raspberrypi: Set the ISP Output1 to 1/4 resolution if unused

In preparation for fast colour denoise, set the low resolution ISP
output stream (Output1) to a 1/4 resolution of the application requested
stream (Output0). This only happens if the application has not requested
an additional YUV or RGB stream.

We also constrain this 1/4 resolution to at most 1200 pixels in the
largest dimension to avoid being too taxing on memory usage and system
bandwidth.

Also switch the default StreamRole::VideoRecording to YUV420 to allow
fast colour denoise to run.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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