gpu: ion: Add secure CMA heap

CMA can now be used for large contiguous allocations. Add
a dedicated heap for secure use cases. This heap intentionally
removes some functionality such as mmaping to userspace for
secure requirements.

Change-Id: I7de94499bd005b405fed546826dae44ae8bc4e20
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
6 files changed