Revert "ARM: dts: msm: Enable iommu_unmap_fast path for trinket GPU SMMU"

This reverts commit 8b239c7249e9("ARM: dts: msm: Enable iommu_unmap_fast
path for trinket GPU SMMU"). This is required as iommu_unmap_fast path
support is disabled from SMMU driver side because of few issues.

Change-Id: I9e2bd43b582e3f3326297c1754f419d774f0d5c5
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>