libcamera: stream: Turn StreamRole into scoped enumeration

The StreamRole enum has enumerators such as 'Raw' that are too generic
to be in the global libcamera namespace. Turn it into a scoped enum to
avoid namespace clashes, and update users accordingly.

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

src/android/camera_capabilities.cpp

@@ -488,7 +488,7 @@ int CameraCapabilities::initializeStreamConfigurations()
 	 * \todo Get this from the camera properties once defined
 	 */
 	std::unique_ptr<CameraConfiguration> cameraConfig =
-		camera_->generateConfiguration({ StillCapture });
+		camera_->generateConfiguration({ StreamRole::StillCapture });
 	if (!cameraConfig) {
 		LOG(HAL, Error) << "Failed to get maximum resolution";
 		return -EINVAL;