iommu/arm-smmu: Pretty-print context fault related regs

Parse out the bitfields for easier-to-read fault messages.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Link: https://lore.kernel.org/r/20240701162025.375134-4-robdclark@gmail.com


Signed-off-by: Will Deacon <will@kernel.org>