f2fs_utils: provide sparse io and dynamic load.

This uses
  external/f2fs-tools LGPL v2.1

It provides low-level IO functions that f2fs-tools/mkfs expects
for writing to the media. In this case we use the sparse lib.

Change-Id: I8d141a0d4d14df9fe84d3b131484e9696fcd8870
Signed-off-by: JP Abgrall <jpa@google.com>
7 files changed