cam: Update command line description for stream role option

The description text lists "stillraw" as a stream role option. This is
incorrect, it should be listed as "raw" instead.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/cam/stream_options.cpp

@@ -13,7 +13,7 @@ using namespace libcamera;
 StreamKeyValueParser::StreamKeyValueParser()
 {
 	addOption("role", OptionString,
-		  "Role for the stream (viewfinder, video, still, stillraw)",
+		  "Role for the stream (viewfinder, video, still, raw)",
 		  ArgumentRequired);
 	addOption("width", OptionInteger, "Width in pixels",
 		  ArgumentRequired);