[mako] add /data mountpoint fixup

Change-Id: I28da79c68e7b84cfca4cceebe7819a8d44b81b59
Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>
Merge pull request #14 from sledges/master

[mako] add /data mountpoint fixup
Handle mass storage lun variations

Signed-off-by: David Greaves <david.greaves@jollamobile.com>