ARM: tegra: Use numeric unit-addresses

Unit-addresses should be numeric. This fixes a validation failure seen
using the json-schema tooling.

Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-paz00.dts

@@ -314,7 +314,7 @@ nvec@7000c500 {
 	memory-controller@7000f400 {
 		nvidia,use-ram-code;
 
-		emc-tables@hynix {
+		emc-tables@0 {
 			nvidia,ram-code = <0x0>;
 			#address-cells = <1>;
 			#size-cells = <0>;