arm64: dts: renesas: sparrow-hawk: Add MSIOF Sound support

Sparrow Hawk has Headset (CONN3) AUX_IN (CONN4) for Sound input/output
which is using MSIOF. Support it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/87plha2wzr.wl-kuninori.morimoto.gx@renesas.com
Link: https://lore.kernel.org/874ixxcg3w.wl-kuninori.morimoto.gx@renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>