DevicePresence: define base object path

Base object path for the detected devices.

Patch was requested in review [1] of gpio-presence sensor.

References:

[1] https://gerrit.openbmc.org/c/openbmc/entity-manager/+/75627/comment/131c96a5_8897394f/

Change-Id: Ifb3d3a8f6d8ae7114222f0d52aa2599405da5d2c
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/yaml/xyz/openbmc_project/Inventory/Source/DevicePresence.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Source/DevicePresence.interface.yaml
index 9b679c6..fe0d0a0 100644
--- a/yaml/xyz/openbmc_project/Inventory/Source/DevicePresence.interface.yaml
+++ b/yaml/xyz/openbmc_project/Inventory/Source/DevicePresence.interface.yaml
@@ -8,3 +8,6 @@
       description: >
           Used by entity-manager to identify which hw was detected. For internal
           use by entity-manager.
+
+paths:
+    - namespace: /xyz/openbmc_project/inventory_source