Remove the ability to switch between gpummu and iommu via kernel config. The new decision path is: if kgsl.mmutype is set, use that. Otherwise if iommu_found() use iommu, and last but not least use the gpummu. Change-Id: I6d34baf72da53e566bfa7081c6741f7fd0180aea Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>