Throttle, Item: Add throttling association

Create association documentation between Throttle and Item.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: Iae6b1d370077f91e2e6d25ef82f2dfcf8bf0051b
diff --git a/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml
index 3bb9683..4eec2bb 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml
+++ b/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml
@@ -79,6 +79,13 @@
       reverse_name: powering
       required_endpoint_interfaces:
           - xyz.openbmc_project.Inventory.Item.PowerSupply
+    - name: throttled_by
+      description: >
+          Objects that implement Chassis can optionally implement the
+          'throttled_by' association to provide a link to throttle.
+      reverse_name: throttling
+      required_endpoint_interfaces:
+          - xyz.openbmc_project.Control.Power.Throttle
     - name: sensors
       description: >
           Sensors may implement an 'inventory' to 'sensors' association with the