drm/msm: Search for the SMMU device in the node sub-devices

The upstream DT model presumes that the iommu phandle is in the main
GPU device node. The downstream model defines sub-nodes for the
IOMMU devices. In order to get the right device to attach the IOMMU
domain to we need to do a bit of searching.

First, check in the top level node. If that fails, then start walking
the port list passed in the attached function - hopefully one of those
will have the right device - if found, use that to attach the domain
and breathe normally.

Change-Id: Ic0dedbad4a1852d2ff204031bd360e0b7960805a
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>

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