ARM: dts: qcom: Update bw table and iommu properties on msm8937 GPU

Following changes are made:

1. Update gpu_bw_tbl in terms of operating point for gpubw.
2. GPU takes care of creating desired dma mapping by itself,
   so disable iommu-dma.
3. Remove unsupported properties "qcom,protect" and
   "qcom,micro-mmu-control".

Change-Id: Ic2d6616ee8097ac6d7e608b6be36808080a126a2