raw: use bmap creation code from bmap-tools

raw: use bmap creation code from bmap-tools

This patch copies the bmap creation code from the bmap-tools project to mic.
Hopefully, at some point we can just make mic package depend on bmap-tools and
directly invoke bmap creation functions from bmap-tools. However, mid
maintainers have issues with this at this point, so we just copy the code.

Unlike the old mic implementation which uses FIBMAP ioctl, bmap-tools use the
FIEMAP ioctl, which is better and also works on btrfs.

Change-Id: I8807ac32d3fcb31e9d410250348318fd04a63275
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>