arm: zynq: Remove ethernet alias for topic-miami

Ethernet is not enabled that's why this alias should be completely
unused.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/dts/zynq-topic-miami.dts b/arch/arm/dts/zynq-topic-miami.dts
index 79a3671..bf421f6 100644
--- a/arch/arm/dts/zynq-topic-miami.dts
+++ b/arch/arm/dts/zynq-topic-miami.dts
@@ -13,7 +13,6 @@
 	compatible = "topic,miami", "xlnx,zynq-7000";
 
 	aliases {
-		ethernet0 = &gem0;
 		serial0 = &uart0;
 		spi0 = &qspi;
 		i2c0 = &i2c0;