arm: dts: am335x: include am33xx-u-boot.dtsi

Include the SoC U-boot DTS in each am335x-<board>-u-boot.dtsi.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
diff --git a/arch/arm/dts/am335x-icev2-u-boot.dtsi b/arch/arm/dts/am335x-icev2-u-boot.dtsi
index cc9569a..67bfac9 100644
--- a/arch/arm/dts/am335x-icev2-u-boot.dtsi
+++ b/arch/arm/dts/am335x-icev2-u-boot.dtsi
@@ -2,6 +2,9 @@
 /*
  * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
  */
+
+#include "am33xx-u-boot.dtsi"
+
 / {
 	xtal25mhz: xtal25mhz {
 		compatible = "fixed-clock";