ARM: dts: at91: sama5d3x: separate motherboard gmac and emac definitions

Separate the definitions for the emac and the gmac in different files and
include them in the final board dts that uses them.

Solves:
Warning (unit_address_vs_reg): Node /ahb/apb/ethernet@f0028000 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /ahb/apb/ethernet@f802c000 has a unit name, but no reg property

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/arch/arm/boot/dts/sama5d33ek.dts b/arch/arm/boot/dts/sama5d33ek.dts
index cbd6a3f..c517b87 100644
--- a/arch/arm/boot/dts/sama5d33ek.dts
+++ b/arch/arm/boot/dts/sama5d33ek.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 #include "sama5d33.dtsi"
 #include "sama5d3xmb.dtsi"
+#include "sama5d3xmb_gmac.dtsi"
 #include "sama5d3xdm.dtsi"
 
 / {