arm: dts: imx7s-warp7: Move u-boot specific node in u-boot.dtsi

These nodes are not in upstream kernel, so move these in u-boot.dtsi

Signed-off-by: Joris Offouga <offougajoris@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

arch/arm/dts/imx7s-warp-u-boot.dtsi

+/ {
+    aliases {
+        mmc0 = &usdhc3;
+        usb0 = &usbotg1;
+    };
+
+    chosen {
+        stdout-path = &uart1;
+    };
+};

arch/arm/dts/imx7s-warp.dts

@@ -17,15 +17,6 @@
 		reg = <0x80000000 0x20000000>;
 	};
 
-	aliases {
-		mmc0 = &usdhc3;
-		usb0 = &usbotg1;
-	};
-
-	chosen {
-		stdout-path = &uart1;
-	};
-
 	gpio-keys {
 		compatible = "gpio-keys";
 		pinctrl-0 = <&pinctrl_gpio>;