arm64/dts: change spi frequence for data quality

reduce spi frequence to prevent data noise

Bug: 118859998
Change-Id: Iad1a1abdc302c851ee125cb437b222ee1ecae490
Signed-off-by: yixuanjiang <[email protected]>

Author: yixuanjiang-tw

arch/arm64/boot/dts/google/sdm670-b4s4-audio.dtsi

@@ -455,7 +455,7 @@
 		irq-gpio = <&tlmm 126 0>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&rt5514_irq>;
-		spi-max-frequency = <20000000>;
+		spi-max-frequency = <10000000>;
 		spi-cpol;
 		spi-cpha;
 	};