ACPI: Retire acpi_iommu_fwspec_ops()

Now that iommu_fwspec_init() can signal for probe deferral directly,
acpi_iommu_fwspec_ops() is unneeded and can be cleaned up.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/011e39e275aba3ad451c5a1965ca8ddf20ed36c2.1719919669.git.robin.murphy@arm.com


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