move OCS port status notification definition to saiswitchextensions.h

Signed-off-by: Nathan Ni <nathan.ni@coherent.com>

Author: wni0812

experimental/saiswitchextensions.h

@@ -262,6 +262,17 @@ typedef enum _sai_switch_attr_extensions_t
      */
     SAI_SWITCH_ATTR_FLOW_BULK_GET_SESSION_EVENT_NOTIFY,
 
+    /**
+     * @brief Set Switch OCS port state change event notification callback function passed to the adapter.
+     *
+     * Use sai_ocs_port_state_change_notification_fn as notification function.
+     *
+     * @type sai_pointer_t sai_ocs_port_state_change_notification_fn
+     * @flags CREATE_AND_SET
+     * @default NULL
+     */
+    SAI_SWITCH_ATTR_OCS_PORT_STATE_CHANGE_NOTIFY,
+
     SAI_SWITCH_ATTR_EXTENSIONS_RANGE_END
 
 } sai_switch_attr_extensions_t;