8064: Add support for using CMA with ion heaps

Adjust the memory reservation/placing code in the board
file to account for heaps that might use CMA. This includes
both dedicated CMA heaps and cp heaps marked as using CMA.

Change-Id: Iabf2e8f5e8d775a1a265380f1fa6b709591ba11d
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>