Add sound support for R-Car V4M.

[Kuninori: adjusted to latest upstream kernel]
Co-developed-by: Khanh Le <khanh.le.xr@renesas.com>
Signed-off-by: Khanh Le <khanh.le.xr@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/87ed8nkxeq.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>