Add support for packet.net's console settings

src/menu.ipxe

@@ -6,11 +6,8 @@ iseq ${cls} serial && goto ignore_cls ||
 set cls:hex 1b:5b:4a  # ANSI clear screen sequence - "^[[J"
 set cls ${cls:string}
 :ignore_cls
-iseq ${ipxe_cloud_config} gce && goto cloud_config || goto version_check
-
-:cloud_config
-set console console=ttyS0,115200n8
-goto version_check
+iseq ${ipxe_cloud_config} gce && set console console=ttyS0,115200n8 || goto version_check
+iseq ${ipxe_cloud_config} packet && set console console=ttyS1,115200n8 || goto version_check
 
 :version_check
 set latest_version 1.04