pipeline: raspberrypi: Only enable embedded stream when available

The pipeline handler would enable and use the Unicam embedded data stream
even if the sensor did not support it. This was to allow a means to
pass exposure and gain values for the frame to the IPA in a synchronised
way.

The recent changes to get the pipeline handler to pass a ControlList
with exposure and gain values means this is no longer required. Disable
the use of the embedded data stream when a sensor does not support it.

This change also removes the mappedEmbeddedBuffers_ map as it is no
longer used.

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

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