iommu/vt-d: Fix 'physical' typos

Fix misspellings of "physical".

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/linux-iommu/20210126211738.2920789-1-helgaas@kernel.org
Link: https://lore.kernel.org/r/20210204014401.2846425-2-baolu.lu@linux.intel.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>