Only look for FDT partitions if our potential parent is a DISK device.
Excluding direct recursion on the flashmap geoms was insufficient
because it did not prevent the underlying device from being retrieved if
flashmap geoms were further partitioned.
Reviewed by: imp
Sponsored by: DARPA, AFRL
into partitions.
Partitions are created based on data in dts file which are
extracted and interpreted by slicer.
Obtained from: Semihalf
Supported by: FreeBSD Foundation, Juniper Networks
