arm64: dts: rockchip: rk3368-xikp: disabled sdmmc

we need uart2 to debug

Change-Id: I09d2acb77b0ea16f21d54a723d1718989f91a31c
Signed-off-by: Zorro Liu <lyx@rock-chips.com>

Author: liuyx1314

arch/arm64/boot/dts/rockchip/rk3368-xikp.dts

@@ -329,7 +329,7 @@
 	num-slots = <1>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>;
-	status = "okay";
+	status = "disabled";
 };
 
 &sdio0 {