Import parse-dynparts

Import parse-dynparts

The project allows to read metadata of a super partition and mount partitions
stored on the super partition using dm-linear. Will be used to implement
the super partition with hal/rootfs dm-linear partitions.
Project url: https://github.com/tchebb/parse-android-dynparts. parse-dynparts
was moved from initrd where it was imported for the first time from
parse-android-dynparts master branch (commit c8837c1). This commit is based
on initrd commit e92dfb3.

Change-Id: I5753df5fd7924fb9d698059406ea322369fc2d7c