Add OLPC XO-1.75 laptop support
This is a Marvell MMP2-based ARM laptop powered by OpenFirwmare. The firmware loads \boot\olpc.fth on a first active partition. It has to be a FAT or Ext* filesystem, with more recent features, such as extents, not being supported. This works well with the default layout with /boot being a separate ext2 partition, with a minor uglyness of olpc.fth being in /boot/boot/.
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