dma updates

Change-Id: I745d921eeb2e86ebe2eb9c886013bdd86189b193
increase resolution of clock period measurement (100 axi cycles -> 1000 axi cycles)

Change-Id: I25088e0b79af75b59afb40dd9fb4b606f1dd62db
updated gralloc/testhdmidisplay.cpp to start frame buffer

Change-Id: Icb87d9bca0ae061a850de60e5563d1d2ac7b8773
use a tagged register for the frame buffer reference

Change-Id: I8e90548d229a4e1574efe6c8268f9fc15c074a66
generate-constraints.py defaults to fmc2

Change-Id: I76e8a5be42a7a38c910c272a6d660b747747ad75
ion -> portal

Change-Id: Ia6c1f9e9d67b337c1dd8b95352e74c9b23fe829b