Now that `Camera::generateConfiguration()` takes a `libcamera::Span` of `StreamRole`, remove the `StreamRoles` type, which was an alias to `std::vector<libcamera::StreamRole>`. The removal has two reasons: - it is no longer strictly necessary, - its presence may suggest that that is the preferred (or correct) way to build/pass a list of `StreamRole`. Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> [Kieran: Fix small checkstyle report on roles initialiser] Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>