arm64: defconfig: Enable SOUND_SOC_RZ

Enable sound driver support for Renesas RZ/G2L based platforms.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20210920093905.10878-2-biju.das.jz@bp.renesas.com


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