arm: mvebu: solidrun: remove hardcoded DTS MAC address

Using a consistent hardcoded MAC address from the DTS file causes
issues when using multiple devices on the same network segment.
Instead rely on environment configuration or random generation.

Signed-off-by: Joel Johnson <mrjoel@lixil.net>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/dts/armada-38x-solidrun-microsom.dtsi b/arch/arm/dts/armada-38x-solidrun-microsom.dtsi
index a322a28..9bbeafc 100644
--- a/arch/arm/dts/armada-38x-solidrun-microsom.dtsi
+++ b/arch/arm/dts/armada-38x-solidrun-microsom.dtsi
@@ -39,7 +39,6 @@
 
 &eth0 {
 	/* ethernet@70000 */
-	mac-address = [00 50 43 02 02 01];
 	pinctrl-0 = <&ge0_rgmii_pins>;
 	pinctrl-names = "default";
 	phy = <&phy_dedicated>;