ASoC: soc-dapm: use dapm->component instead of container_of()

Because struct snd_soc_dapm_context is soc-dapm framework specific, user
driver don't need to access its member directly, we would like to hide
them. struct snd_soc_dapm_context will be removed from header in the
future.

Now, snd_soc_dapm_to_component() (A) will convert dapm to component by
container_of() (a).

(A)	static inline struct snd_soc_component *snd_soc_dapm_to_component(
		struct snd_soc_dapm_context *dapm)
	{
(a)		return container_of(dapm, struct snd_soc_component, dapm);
	}

dapm of component works, but dapm of card will be "unknown" pointer
(= not NULL), because (a) is using "container_of()".

OTOH, ASoC will call snd_soc_dapm_init() (X) to initialize dapm, and
it will be called from snd_soc_bind_card() (p) (for card) or
soc_probe_component() (q) (for component) with component pointer.

(p)	static int snd_soc_bind_card(...)
	{
		...
(X)		snd_soc_dapm_init(..., NULL);
		...                    ^^^^
	}

(q)	static int soc_probe_component(...)
	{
		...
(X)		snd_soc_dapm_init(..., component);
		...                 ^^^^^^^^^
	}

And snd_soc_dapm_init() (X) will fill dapm->component (x)

(X)	void snd_soc_dapm_init(..., component, ...)
	{
		...
(x)		dapm->component	= component;
		...
	}

We can simply use dapm->component in snd_soc_dapm_to_component() (A).
In this case, dapm of card (p) will be just NULL.

Use dapm->component instead of container_of().
The picky note can be removed by this patch.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87a53ax06q.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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