cli: remove obsolete 'nmcli nm'

The functionality is present in 'general', 'networking' and 'radio'.
We changed syntax anyway, so it doesn't make much sense to keep 'nm'.

cli/src/nmcli.c

@@ -113,8 +113,6 @@ static const struct cmd {
 	{ "connection", do_connections },
 	{ "device",     do_devices },
 	{ "help",       do_help },
-	/* Deprecated objects; only kept for backwards compatibility */
-	{ "nm",         do_network_manager },
 	{ 0 }
 };