libcamera: ipu3: Use roles in stream configuration

Use and inspect the stream roles provided by the application to
streamConfiguration() to assign streams to their intended roles and
return a default configuration associated with them.

Support a limited number of usages, with the viewfinder stream able to
capture both continuous video streams and still images, and the main
output stream supporting still images only. This is an artificial
limitation until we figure out the exact capabilities of the hardware.

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

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