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Linux supports root=PARTUUID=<partuuid> boot argument, so add support for probing it. Compared to the fs UUID, the partition UUID does not change when reformatting a partition. For now, only disks using a GPT partition table are supported. Signed-off-by: Jacob Kroon <jacob.kroon@gmail.com> Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>