ARM: imx: udoo_neo: convert to DM_MMC

Convert UDOO Neo to use DM MMC.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Francesco Montefoschi <francesco.montefoschi@udoo.org>
Cc: Breno Lima <breno.lima@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/dts/imx6sx-udoo-neo-u-boot.dtsi b/arch/arm/dts/imx6sx-udoo-neo-u-boot.dtsi
new file mode 100644
index 0000000..daf2489
--- /dev/null
+++ b/arch/arm/dts/imx6sx-udoo-neo-u-boot.dtsi
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/ {
+	aliases {
+		mmc0 = &usdhc2;
+	};
+};