msm: Add new partition for IOMMU video domain

Video hardware requires its firmware address to be lower
than the the other addresses that it accesses. In addition
secure playback requires the end of the firmware address
range to be adjacent to the main memory used by the video
hardware.

Add a new partition and rename partitions to appropriate names
to enforce the order of the memory regions.

Change-Id: I5d35dbab38a4be66eb464fee42e0e844404d5cf7
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>