ARM: STi: DT: STiH418: Add dt nodes for sdhci and emmc.

Add dt nodes to enable sdhci / eMMC for stih418-b2199 board.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih418-b2199.dts

@@ -74,5 +74,17 @@ i2c@9541000 {
 			st,i2c-min-scl-pulse-width-us = <0>;
 			st,i2c-min-sda-pulse-width-us = <5>;
 		};
+
+		mmc1: sdhci@09080000 {
+			status = "okay";
+		};
+
+		mmc0: sdhci@09060000 {
+			status = "okay";
+			max-frequency = <200000000>;
+			sd-uhs-sdr50;
+			sd-uhs-sdr104;
+			sd-uhs-ddr50;
+		};
 	};
 };