ARM: dts: Add bus bw voting to IOMMUv0 nodes

Add bus voting data to IOMMUv1 nodes allowing IOMMU driver to vote for
bus bandwidth when the IOMMU is being used. This is required for
certain clocks to turn on.

CRs-fixed: 483497
Change-Id: If1d59c5c1c39514f2f2b67f5c1a005fbfab30615
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>