soc: qcom: port some changes from kernel 4.4

Port last spcom changes from kernel msm-4.4.
Last ported snapshot is commit ab15752d1c38 ("spcom: check error from
ion_import_dma_buf()")

Change-Id: I52dc72a1683d62f3c88940b03b18c2f5730dca6d
Signed-off-by: Kineret Berger <kberger@codeaurora.org>