ARM: dts: am33xx: add ocp label

Add label to the ocp node in the AM33xx SoC include so that it can be
referenced in board-level files like am335x-pocketbeagle.dts
Signed-off-by: Drew Fustini <drew@beagleboard.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am33xx.dtsi

@@ -172,7 +172,7 @@ mpu {
 	 * for the moment, just use a fake OCP bus entry to represent
 	 * the whole bus hierarchy.
 	 */
-	ocp {
+	ocp: ocp {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;