iommu: arm-smmu: Support ECATS during context fault

The TBU will complete the halt sequence only if there are no pending
transactions. This includes transactions stalled by an ongoing context
fault. When halting the TBU, disable stall on fault and fault
interrupt reporting. Clear any pending faults via terminate register.

Additionally, add an error message for maximum address range.

Change-Id: If1a6059594f8ec98c91ea0be59d8c7c6bf2f55a3
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>