ARM: dts: imx51-ts4800: Fix 'port@0' node with unit name and no reg property

The following build warning is seen with W=1:

Warning (unit_address_vs_reg): Node /display-di0/port@0 has a unit name,
but no reg property

Fix this warning by removing '@' from such node.
Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51-ts4800.dts

@@ -71,7 +71,7 @@ display-timings {
 			};
 		};
 
-		port@0 {
+		port {
 			display0_in: endpoint {
 				remote-endpoint = <&ipu_di0_disp1>;
 			};