Revert "drm/etnaviv: trick drm_mm into giving out a low IOVA"

Now that commandstreams are handled through the cmdbuf suballocator
the workaround to make the IOVA games work is not needed anymore.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

drivers/gpu/drm/etnaviv/etnaviv_mmu.c

@@ -117,14 +117,9 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
 		struct list_head list;
 		bool found;
 
-		/*
-		 * XXX: The DRM_MM_SEARCH_BELOW is really a hack to trick
-		 * drm_mm into giving out a low IOVA after address space
-		 * rollover. This needs a proper fix.
-		 */
 		ret = drm_mm_insert_node_in_range(&mmu->mm, node,
 			size, 0, mmu->last_iova, ~0UL,
-			mmu->last_iova ? DRM_MM_SEARCH_DEFAULT : DRM_MM_SEARCH_BELOW);
+			DRM_MM_SEARCH_DEFAULT);
 
 		if (ret != -ENOSPC)
 			break;