iommu: msm: allow CBs to report an error when faults

Some clients of IOMMU treats the CB fault as non-recoverable
and they may want to trap the fault for debug purpose. Provide
that provision via context bank DT property.

Change-Id: Icb9cb67ed3dac44e144fcd7bc85deca833bf941c
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>