msm: camera: support fault handlers for dual vfe usecase

IOMMU fault handler supports only one token per domain.
In Dual vfe use cases, vfe driver registers smmu fault
handler per each device node. Vfe needs to stop if page
fault happens on either vfe device.

Add the support to register fault handlers in the
camera smmu driver per device and trigger the fault handler
for both devices when fault happens on either device.

Change-Id: I7fdf851f595ca968a26cf3f49e490b93bc4535bf
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>