arm64: dts: rockchip: Fix wrong rt5514 dmic delay property for Gru

According to rt5514 dt-binding, it should be "realtek,dmic-init-delay-ms".

Fixes: 48f4d979 (arm64: dts: rockchip: add Gru/Kevin DTS)
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi

@@ -616,7 +616,7 @@ headsetcodec: rt5514@57 {
 		interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&mic_int>;
-		realtek,dmic-init-delay = <20>;
+		realtek,dmic-init-delay-ms = <20>;
 		wakeup-source;
 	};
 };