ASoC: rcar: add Gen2 sound support

This patch adds Gen2 sound support for Renesas R-Car.
But, it is supporting PIO transfer only at this point

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc sound/soc/sh/rcar/gen.c
Simple merge

diff --cc sound/soc/sh/rcar/rsnd.h
Simple merge

diff --cc sound/soc/sh/rcar/ssi.c
Simple merge