drm/nouveau/tegra: Stop using iommu_present()
Even if some IOMMU has registered itself on the platform "bus", that doesn't necessarily mean it provides translation for the device we care about. Replace iommu_present() with a more appropriate check. Signed-off-by:Robin Murphy <robin.murphy@arm.com> Reviewed-by:
Lyude Paul <lyude@redhat.com> [added cc for stable] Signed-off-by:
Lyude Paul <lyude@redhat.com> Cc: stable@vger.kernel.org # v5.0+ Link: https://patchwork.freedesktop.org/patch/msgid/70d40ea441da3663c2824d54102b471e9a621f8a.1649168494.git.robin.murphy@arm.com
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