Enable UMS share for sdcards with wrong lun path.
Based on 'vold: support more than 1 UMS share'

Original authors:
 Alex Zepeda <alex@inferiorhumanorgans.com>
 Genokolar <genokolar@gmail.com>
 Josh Stone <cuviper@gmail.com>
 mik_os <kiril.mik.os@gmail.com>
 Oran Avraham <oranav@gmail.com>
 Pawit Pornkitprasan <p.pawit@gmail.com>
 Tony Layher <layhertony@gmail.com>