Add 'dBm' units to 'Signal' and 'Noise' to match what non-ucode iwinfo shows. Before: Signal: -49 Noise: -103 After: Signal: -49 dBm Noise: -103 dBm Signed-off-by: Sean Khan <datapronix@protonmail.com> Link: https://github.com/openwrt/openwrt/pull/18039 Signed-off-by: Robert Marko <robimarko@gmail.com>