ARM: dts: imx6ul: segin: Move machine include to dts files

Move the imx6ul.dtsi include to the dts files so it is easier to reuse
the SOM dtsi for e.g. an i.MX 6ULL SOM.
Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi

@@ -7,7 +7,6 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/pwm/pwm.h>
-#include "imx6ul.dtsi"
 
 / {
 	model = "PHYTEC phyCORE-i.MX6 UltraLite";

arch/arm/boot/dts/imx6ul-phytec-segin-ff-rdk-nand.dts

@@ -5,6 +5,7 @@
  */
 
 /dts-v1/;
+#include "imx6ul.dtsi"
 #include "imx6ul-phytec-phycore-som.dtsi"
 #include "imx6ul-phytec-segin.dtsi"
 #include "imx6ul-phytec-segin-peb-eval-01.dtsi"