libcamera: stream: Rename StillCaptureRaw to Raw

With the buffer copy removed from all pipelines for raw capture
rename StillCaptureRaw to Raw to better describe the role.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

include/libcamera/stream.h

@@ -59,8 +59,8 @@ private:
 };
 
 enum StreamRole {
+	Raw,
 	StillCapture,
-	StillCaptureRaw,
 	VideoRecording,
 	Viewfinder,
 };