ALSA SoC has for_each_rtdcom() which is link list for
rtd-component which is called as rtdcom. The relationship image is like below

			       rtdcom	   rtdcom      rtdcom
			       component   component   component
	rtd->component_list -> list	-> list	    -> list ...

Here, the pointer get via normal link list is rtdcom,
Thus, current for_each loop is like below, and need to get
component via rtdcom->component

	for_each_rtdcom(rtd, rtdcom) {
		component = rtdcom->component;
		...
	}

but usually, user want to get pointer from for_each_xxx is component
directly, like below.

	for_each_rtd_component(rtd, rtdcom, component) {
		...
	}

This patch expands list_for_each_entry manually, and enable to get
component directly from for_each macro.
Because of it, the macro becoming difficult to read,
but macro itself becoming useful.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/878spm64m4.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>