* util/getroot.c (find_root_device): Skip devices that match
/dev/dm-[0-9]. This lets the real device be found for any type of
abstraction (LVM, EVMS, RAID..).
(grub_guess_root_device): Do not traverse /dev/mapper (for LVM)
and /dev/evms (for EVMS) before traversing /dev. If a /dev/dm-[0-9]
device is found first, find_root_device() will now skip it.