drm: etnaviv: clean up submit_bo()

As we now store the etnaviv_vram_mapping, we no longer need to store
the iova itself: we can get this directly from the mapping structure.
Arrange for submit_bo() to return a pointer to etnaviv_gem_submit_bo,
and directly access mapping->iova when applying relocations.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.h b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
index 22f350b..02665d8 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -88,6 +88,12 @@
 
 #define MAX_CMDS 4
 
+struct etnaviv_gem_submit_bo {
+	u32 flags;
+	struct etnaviv_gem_object *obj;
+	struct etnaviv_vram_mapping *mapping;
+};
+
 /* Created per submit-ioctl, to track bo's and cmdstream bufs, etc,
  * associated with the cmdstream submission for synchronization (and
  * make it easier to unwind when things go wrong, etc).  This only
@@ -99,12 +105,7 @@
 	struct ww_acquire_ctx ticket;
 	u32 fence;
 	unsigned int nr_bos;
-	struct {
-		u32 flags;
-		struct etnaviv_gem_object *obj;
-		struct etnaviv_vram_mapping *mapping;
-		u32 iova;
-	} bos[0];
+	struct etnaviv_gem_submit_bo bos[0];
 };
 
 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,