iommu/arm-smmu: Un-demote unhandled-fault msg

Previously this was dev_err_ratelimited() but it got changed to a
ratelimited dev_dbg().  Change it back to dev_err().

Fixes: d525b0af ("iommu/arm-smmu: Pretty-print context fault related regs")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Link: https://lore.kernel.org/r/20240809172716.10275-1-robdclark@gmail.com


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