msm: kgsl: Disable stall on fault for GMU context bank

Stall on fault must be disabled for the GMU context bank as
an SMMU stall will cause the GMU memory transaction to hang when
there is a pagefault. As a result, the GMU becomes unresponsive
and we do not get any CM3 state which can help debug the pagefault.
With stall on fault disabled, when there is a GMU pagefault,
a bus fault is triggered and the GMU enters the bus fault handler
as expected.

Change-Id: Id3452ad0df606eafefda4dcd8b1801c22fbf0815
Signed-off-by: Sushmita Susheelendra <ssusheel@codeaurora.org>
Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>