drm/i915: Squeeze iommu status into debugfs/i915_capabilities

There's no easy way of checking whether iommu is enabled for the GPU
(you can grep dmesg if you know the device, or you can grep
i915_gpu_info if that's available). We do have a central
i915_capabilities with the intent of listing such pertinent information,
so add the iommu status.

Suggested-by: Martin Peres <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: Martin Peres <[email protected]>
Cc: Tomi Sarvela <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Acked-by: Martin Peres <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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