an to list its information with command ls.
* fs/ieee1275/ofnet.c (grub_ofnet_open): parse parameters to determine netdisk data
* fs/ieee1275/ofnet.c (grub_ofnet_close): dealloc netdisk data
* include/grub/disk.h: added struct grub_netdisk_data
* include/grub/ieee1275/ofnet.h: added newline
* kern/disk.c (grub_disk_open): ignore partition check for netdisk
* normal/misc.c (grub_normal_print_device_info): added support to list netdisk information
