ARM: dts: imx7d-smegw01: Fix the SDIO description

usdhc2 is connected to a Wifi chip that is powered by a 3.3V supply.

Pass the "no-1-8-v" property to guarantee that no communication is
made at 1.8V.

While at it, also remove the unnecessary properties: "cap-sd-highspeed",
"sd-uhs-ddr50", and "mmc-ddr-1_8v".

Fixes: 9ac0ae97 ("ARM: dts: imx7d-smegw01: Add support for i.MX7D SMEGW01 board")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-smegw01.dts

@@ -216,10 +216,8 @@ &usdhc2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usdhc2>;
 	bus-width = <4>;
+	no-1-8-v;
 	non-removable;
-	cap-sd-highspeed;
-	sd-uhs-ddr50;
-	mmc-ddr-1_8v;
 	vmmc-supply = <&reg_wifi>;
 	enable-sdio-wakeup;
 	status = "okay";