Revert "iommu.h/of.h: Updated the headers, msm: display: include msm-specific ion header, msm: display: Fix build errors caused by Ion changes, msm: kgsl: Fix build without OCMEM support"

This reverts commit cbeed744004b09d031a9c4b525122fd01392095b.
Revert "msm: kgsl"

This reverts commit e4c487ae19266ec822962109a1ee7289408b3df0.