msm: Kconfig: Enable IOMMU CPU-GPU synchronization

Enable synchronization between CPU and GPU for
IOMMU configuration register accesses.

Change-Id: I7409090c0fc811fa28562644bcbfd4f91a8a7425
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/Kconfig
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: Alex Wong <waiw@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/Kconfig