ION clients allocating from a content protection heap (cp heap) must be able to map the memory to an IOMMU when IOMMU are being used. Add callbacks to CP heap to support IOMMU mapping. Change-Id: I5dd70096edcab4866a436ae4447f9a6e00e2f0ec Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>