drm/msm: drop cache sync hack

Now that it isn't causing problems to use dma_map/unmap, we can drop the
hack of using dma_sync in certain cases.
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_gem.c

@@ -52,26 +52,16 @@ static void sync_for_device(struct msm_gem_object *msm_obj)
 {
 	struct device *dev = msm_obj->base.dev->dev;
 
-	if (get_dma_ops(dev) && IS_ENABLED(CONFIG_ARM64)) {
-		dma_sync_sg_for_device(dev, msm_obj->sgt->sgl,
-			msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
-	} else {
-		dma_map_sg(dev, msm_obj->sgt->sgl,
-			msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
-	}
+	dma_map_sg(dev, msm_obj->sgt->sgl,
+		msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 }
 
 static void sync_for_cpu(struct msm_gem_object *msm_obj)
 {
 	struct device *dev = msm_obj->base.dev->dev;
 
-	if (get_dma_ops(dev) && IS_ENABLED(CONFIG_ARM64)) {
-		dma_sync_sg_for_cpu(dev, msm_obj->sgt->sgl,
-			msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
-	} else {
-		dma_unmap_sg(dev, msm_obj->sgt->sgl,
-			msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
-	}
+	dma_unmap_sg(dev, msm_obj->sgt->sgl,
+		msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 }
 
 /* allocate pages from VRAM carveout, used when no IOMMU: */