ARM: dts: imx7: imx7_colibri: introduce fec node

Sync DTS with the mainline Linux and introduce fec node and
regulator configuration for rn5t567 PMU.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
diff --git a/arch/arm/dts/imx7s.dtsi b/arch/arm/dts/imx7s.dtsi
index 5067b9f..5c2e98b 100644
--- a/arch/arm/dts/imx7s.dtsi
+++ b/arch/arm/dts/imx7s.dtsi
@@ -87,6 +87,7 @@
 		spi2 = &ecspi2;
 		spi3 = &ecspi3;
 		spi4 = &ecspi4;
+		ethernet0 = &fec1;
 	};
 
 	cpus {