msm: kgsl: Insert kgsl idle for iommu-v1 when pagetables are changed.

An idle is needed for iommu-v1 before programming both tlb registers
and the pagetable register. Without this idle faults are observed on
2D core because a process uses another processes pagetable.

Change-Id: Ief14cd79b8e7ffaed413da49dc4b9e8416233186
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>