arm64: dts: renesas: ulcb/ulcb-kf: switch to use audio-graph-card2 for sound

Current ULCB{-KF} are using audio-graph-card.
Now ALSA is supporting new audio-graph-card2 which can easily handle
more advanced feature. Let's switch to use it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/20220124021142.224592-2-kuninori.morimoto.gx@renesas.com


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