Use DECLARE_FLEX_ARRAY() helper in drivers/dma/sh/rcar-dmac.c

[GustavoARSilva]

diff -u -p ./drivers/dma/sh/rcar-dmac.c /tmp/nothing/drivers/dma/sh/rcar-dmac.c
--- ./drivers/dma/sh/rcar-dmac.c
+++ /tmp/nothing/drivers/dma/sh/rcar-dmac.c
@@ -104,7 +104,6 @@ struct rcar_dmac_desc_page {

        union {
                struct rcar_dmac_desc descs[0];
-               struct rcar_dmac_xfer_chunk chunks[0];
        };
 };