ARM: dts: pico-imx7d: Add u-boot.dtsi for uboot specific dts change

This commit introduce u-boot.dtsi

Signed-off-by: Joris Offouga <offougajoris@gmail.com>
Suggested-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/dts/imx7d-pico-u-boot.dtsi b/arch/arm/dts/imx7d-pico-u-boot.dtsi
new file mode 100644
index 0000000..1bd7f4f
--- /dev/null
+++ b/arch/arm/dts/imx7d-pico-u-boot.dtsi
@@ -0,0 +1,11 @@
+/{
+    aliases {
+        mmc0 = &usdhc3;
+        usb0 = &usbotg1;
+    };
+};
+
+&usbotg1 {
+	dr_mode = "peripheral";
+ };
+