Revert "msm: Kconfig: Enable IOMMU CPU-GPU synchronization"

IOMMU CPU-GPU sync is clobbering our modem on mint.

Kill it with fire as it does not appear to be necessary,
it is not used on d2

This reverts commit f106e38769dc1a7213a81c88dab37fa949e0e03f.

Change-Id: Ib6b95525a1a16cf74b695f5d591d2372783491b2