Add support for MikroTik RB5009UG

My (now slightly less) long term (formerly seemingly) crazy idea was to attempt to make this platform into a ISP fiber tower -> cake based shaper, leveraging either libreqos.io or (more likely) bracketqos, which leverages rust, xdp, and ebpf: BracketQos - Rust, EBPF, XDP, & cake, oh my!