iommu/arm-smmu: Print SID info on context faults

When a context fault occurs, it can be useful for debugging to know the
stream ID of the faulting transaction.  This information is available in
the CBFRSYNRAn register.  Read and print the SID value when a context
fault occurs.

Change-Id: If8b47b801bc72a053b1198767de58799606ca626
Signed-off-by: Shalaj Jain <shalajj@codeaurora.org>
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>