ARM64: dts: rk3399-box: add card-detect-delay property

Practice shows :
	The sd cards are easier to be identified after increase delay

Change-Id: I48912e2d184902fab8b27edba70281f0bf19b9ab
Signed-off-by: xiaoyao <xiaoyao@rock-chips.com>

Author: ArseneWg

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

@@ -225,6 +225,7 @@
 	vqmmc-supply = <&vcc_sd>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>;
+	card-detect-delay = <800>;
 	status = "okay";
 };