arm64: dts: renesas: rzg2ul-smarc: Enable Audio

Enable Audio on RZ/G2UL SMARC EVK by adding ssi1 pincontrol entries
to the soc-pinctrl dtsi and ssi1 and cpu sound_dai nodes to the board
dtsi.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220429072400.23729-3-biju.das.jz@bp.renesas.com


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