Since this host controller can merge bigger segments if DMA API
layer cam merge the segments, this patch adds the flag.
Signed-off-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>