ASoC: simple-card: merge simple-scu-card

simple-card and simple-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 time by
one sound card. This patch merges both sound card into
simple-card. Now we can use both feature on same driver.

simple-card is now supporting .compatible = "simple-scu-audio-card".
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/Kconfig

@@ -6,6 +6,7 @@ config SND_SIMPLE_CARD
 	select SND_SIMPLE_CARD_UTILS
 	help
 	  This option enables generic simple sound card support
+	  It also support DPCM of multi CPU single Codec ststem.
 
 config SND_SIMPLE_SCU_CARD
 	tristate "ASoC Simple SCU sound card support"