ASoC: audio-graph-card: merge audio-graph-scu-card

audio-graph-card and audio-graph-scu-card are very similar driver,
but the former is supporting normal sound card,
the latter is supporting DPCM sound card.

We couldn't use normal sound and DPCM sound in same sound card by
audio-graph-card.
This patch merges both sound card into it.
Now we can use both feature on same driver.

audio-grap-card is now supporting .compatible = "audio-graph-scu-card".
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/Kconfig

@@ -22,6 +22,7 @@ config SND_AUDIO_GRAPH_CARD
 	help
 	  This option enables generic simple sound card support
 	  with OF-graph DT bindings.
+	  It also support DPCM of multi CPU single Codec ststem.
 
 config SND_AUDIO_GRAPH_SCU_CARD
 	tristate "ASoC Audio Graph SCU sound card support"