Align all data structures (reserved sectors, FATs, root directory for
FAT12/16) to an even multiple of the cluster size. This means that if
the partition is aligned, so will all clusters be. This adds
significant performance for anything where the physical sector size is
larger than the logical sector size, e.g. flash media or large-sector
hard disks.
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>