iommu: msm: Add support for alt. regulator

Some IOMMU's need alterative regulators to be turned on
to access IOMMU registers. Add support for adding a second
regulator to a IOMMU device.

Change-Id: I021e518c41bad9f0f92b7b07e362f045f17a5199
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
4 files changed