msm: kgsl: Skip DTCM and NMI if SMMU is stalled

Accessing DTCM when SMMU is stalled can lead to NoC timeouts.
Also, skip sending NMI to GMU because GMU will not be able
to save cm3 state to DDR if SMMU is stalled.

Change-Id: I56a5399ca4847c6463862141f362e01fb86d3669
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>