Revert "Revert "MediaProvider: get UUID of removable volumes for non-FAT filesystems""

Summary:
This reverts commit a6860dd5e780780ccdb5e2e6f8dd8852ba27c56d.

Depends on D260.

Test Plan: Build and test it.

Reviewers: Mustaavalkosta, randall.rushing, michyprima, rlasalle15, Roach, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D261

Change-Id: I196b46ac35fb2e35ec8298e0f3f0421d0696b167