arm64: renesas: salvator-common: avoid audio_clkout naming conflict

clock name of "audio_clkout" is used by Renesas sound driver.
This duplicated naming breaks its clock registering/unregistering.
Especially, when unbind/bind it can't handle clkout correctly.
This patch renames "audio_clkout" to "audio-clkout" to avoid
naming conflict.

Fixes: 8a8f181d ("arm64: renesas: salvator-x: use CS2000 as AUDIO_CLK_B")
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/salvator-common.dtsi

@@ -45,7 +45,7 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
-	audio_clkout: audio_clkout {
+	audio_clkout: audio-clkout {
 		/*
 		 * This is same as <&rcar_sound 0>
 		 * but needed to avoid cs2000/rcar_sound probe dead-lock