ASoC: simple-card: remove platform data style

Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> says:

SuperH ecovec24/7724se are the last user of Simple Audio Card as
"platform data style". It is mainly supporting "DT style" in these days.

Now, Simple Audio Card "platform data style" is no longer correctly working
during almost this 10 years. but we have not get such report.
Let's remove Sound support from SuperH ecovec24/7724se, and remove
Simple Audio Card platform data style.

Link: https://patch.msgid.link/87zf1le4fu.wl-kuninori.morimoto.gx@renesas.com

diff --cc MAINTAINERS
Simple merge

diff --cc sound/soc/amd/yc/acp6x-mach.c
Simple merge

diff --cc sound/soc/fsl/fsl_sai.c
Simple merge