libsys: mark regions allocated for DMA as special

This ensures that they will not be relocated.

Edited by David van Moolenbroek.

Change-Id: Ic2a97bc65b94dfcf364c06577aa340a9a5299e74

New sources layout

Change-Id: Ic716f336b7071063997cf5b4dae6d50e0b4631e9