ASoC: test-component: add Test Component for Sound debug/test

We already have dummy-codec, dummy-platform.
But its issues are
	1) we don't have dummy-cpu,
	2) we can't select it via DeviceTree
	3) It do nothing

Sometimes we want to have Dummy Sound Component for debugging,
for testing, for learning Framework behavior, etc, etc...
This patch adds Test-Component driver for it.

User can select CPU   Component by using "test-cpu"   compatible,
and  can select Codec Component by using "test-codec" compatible.

It doesn't support Platform so far, but is easy to add.

We can verbose print to know its progress if user selected
xxx-verbose compatible driver.

for example,
	test-cpu		   : silent  Component, silent  DAI
	test-cpu-verbose-component : verbose Component, silent  DAI
	test-cpu-verbose-dai	   : silent  Component, verbose DAI
	test-cpu-verbose	   : verbose Component, verbose DAI
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/877dein8rx.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/Kconfig

@@ -17,3 +17,9 @@ config SND_AUDIO_GRAPH_CARD
 	  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_TEST_COMPONENT
+	tristate "ASoC Test component sound support"
+	depends on OF
+	help
+	  This option enables test component sound driver support.

sound/soc/generic/Makefile

@@ -2,7 +2,9 @@
 snd-soc-simple-card-utils-objs	:= simple-card-utils.o
 snd-soc-simple-card-objs	:= simple-card.o
 snd-soc-audio-graph-card-objs	:= audio-graph-card.o
+snd-soc-test-component-objs	:= test-component.o
 
 obj-$(CONFIG_SND_SIMPLE_CARD_UTILS)	+= snd-soc-simple-card-utils.o
 obj-$(CONFIG_SND_SIMPLE_CARD)		+= snd-soc-simple-card.o
 obj-$(CONFIG_SND_AUDIO_GRAPH_CARD)	+= snd-soc-audio-graph-card.o
+obj-$(CONFIG_SND_TEST_COMPONENT)	+= snd-soc-test-component.o