arm64: renesas: ulcb: fixup audio_clkout

"audio_clkout" is dummy clock of <&rcar_sound 0> to avoid clock loop
which invites probe conflict. Thus <&rcar_sound 0> and "audio_clkout"
should be same value.

On commit 2752660a ("arm64: dts: renesas: ulcb: sound
clock-frequency needs descending order") exchanged <&rcar_sound 0>,
but it didn't modify "audio_clkout".
This patch fixup it.

Fixes: 2752660a ("arm64: dts: renesas: ulcb: sound clock-frequency needs descending order")
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/ulcb.dtsi

@@ -31,7 +31,7 @@ audio_clkout: audio-clkout {
 		 */
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
-		clock-frequency = <11289600>;
+		clock-frequency = <12288000>;
 	};
 
 	hdmi0-out {