ARM: dts: exynos: Add external SD card support for Trats board

Enable support for SDHCI controller number 2 and add required regulator
for external SD card.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos4210-trats.dts

@@ -385,6 +385,12 @@
 			     regulator-max-microvolt = <1800000>;
 			};
 
+			tflash_reg: LDO17 {
+			     regulator-name = "VTF_2.8V";
+			     regulator-min-microvolt = <2800000>;
+			     regulator-max-microvolt = <2800000>;
+			};
+
 			vddq_reg: LDO21 {
 			     regulator-name = "VDDQ_M1M2_1.2V";
 			     regulator-min-microvolt = <1200000>;
@@ -452,6 +458,15 @@
 	status = "okay";
 };
 
+&sdhci_2 {
+	bus-width = <4>;
+	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus4>;
+	pinctrl-names = "default";
+	vmmc-supply = <&tflash_reg>;
+	cd-gpios = <&gpx3 4 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
 &serial_0 {
 	status = "okay";
 };