[ros-diffs] [ion] 24737: - FSTUB Patch for Mount Manager Support, Part 1: - Create new /fstub directory in the kernel tree and move iomgr's xhal functions there. - Delete disk.c entirely from iomgr.c and spread it across fstub. - Entirely reimplement from scratch IoWritePartitionTable, IoReadPartitionTable, IoSetPartitionInformation, HalExamineMbr. Lots of bug fixes in terms of wrong assumptions and compatibility with weird partition tables. - Fix prototype of IoAssignDriveLetters, but for now, keep the old