drm/msm: convert iova to 64b

For a5xx the gpu is 64b so we need to change iova to 64b everywhere.  On
the display side, iova is still 32b so it can ignore the upper bits.
(Although all the armv8 devices have an iommu that can map 64b pa to 32b
iova.)

Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/msm_gpu.h

@@ -80,7 +80,7 @@ struct msm_gpu {
 
 	/* ringbuffer: */
 	struct msm_ringbuffer *rb;
-	uint32_t rb_iova;
+	uint64_t rb_iova;
 
 	/* list of GEM active objects: */
 	struct list_head active_list;