Revert "Don't set kgsl.mmutype=gpummu in command line, let kernel pick iommu"

This reverts commit 454daa4f7bcd0ed7601843167d839e60265bd1f2.
Merge pull request #16 from razrqcom-dev-team/cm-10.1

Revert "Don't set kgsl.mmutype=gpummu in command line, let kernel pick i...