ARM: dts: sbc-t3x: disable mmc3

Disable mmc3 interface, since is not used on sbc-t3x boards.
Signed-off-by: Dmitry Lifshitz <lifshitz@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap3-cm-t3x.dtsi

@@ -51,6 +51,10 @@ &mmc1 {
 	bus-width = <4>;
 };
 
+&mmc3 {
+	status = "disabled";
+};
+
 &i2c1 {
 	clock-frequency = <400000>;
 };