ion: add snapshot of ion support for MSM

This is a snapshot of the ION support as of msm-3.10 commit
commit acdce027751d
("Merge "defconfig: arm64: Enable ONESHOT_SYNC for msm8994"")

Change-Id: I225616c1ef9e3bb2643b61a8870357e7bbece33e
Signed-off-by: Kumar Gala <galak@codeaurora.org>
[mitchelh: dropped MSM changes to ion_chunk_heap, dropped MSM changes to
 ion_carveout_heap]
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
[pdaly: deprecated ion_cma_secure_heap.c & msm_ion_priv.h]
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>