iommu/amd: Use page mode macros in fetch_pte()

Use the page mode macros instead of magic numbers in fetch_pte.

Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20230420080718.523132-1-jsnitsel@redhat.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: snits

drivers/iommu/amd/io_pgtable.c

@@ -310,8 +310,8 @@ static u64 *fetch_pte(struct amd_io_pgtable *pgtable,
 			return NULL;
 
 		/* Large PTE */
-		if (PM_PTE_LEVEL(*pte) == 7 ||
-		    PM_PTE_LEVEL(*pte) == 0)
+		if (PM_PTE_LEVEL(*pte) == PAGE_MODE_7_LEVEL ||
+		    PM_PTE_LEVEL(*pte) == PAGE_MODE_NONE)
 			break;
 
 		/* No level skipping support yet */