dt-bindings: iommu: add support for qcom,iommu-geometry

		  option can be used to specify the testbus version to support testbus interface.

		  Type is <u32>.

- qcom,iommu-geometry:

          Allow clients to extend the available IOVA space by setting the

          DOMAIN_ATTR_GEOMETRY domain attribute. The new IOVA space created

          will be a superset of the IOVA range which was created through the

          create mapping call. The DOMAIN_ATTR_GEOMETRY domain attribute can

          only be set before attaching.

- clocks        : List of clocks to be used during SMMU register access. See

                  Documentation/devicetree/bindings/clock/clock-bindings.txt

                  for information about the format. For each clock specified