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-pdu001-u-boot.dtsi b/arch/arm/dts/am335x-pdu001-u-boot.dtsi
index a799fe9..4f4fc41 100644
--- a/arch/arm/dts/am335x-pdu001-u-boot.dtsi
+++ b/arch/arm/dts/am335x-pdu001-u-boot.dtsi
@@ -3,6 +3,8 @@
  * Copyright (C) 2018 EETS GmbH - https://www.eets.ch/
  */
 
+#include "am33xx-u-boot.dtsi"
+
 / {
 	ocp {
 		u-boot,dm-pre-reloc;