Miscellaneous updates to inventory interfaces

- Placed interfaces corresponding to physical items under
  Inventory/Item/ and interfaces which serve as item decorators under
  Inventory/Decorator/.
- Add some new dbus interfaces.
- Restructured Board item related interfaces such that there's a parent
  Board interface, and derivatives such as Motherboard, IO board, etc.
- Added new properties to existing interfaces.

Change-Id: I52b7c1a789df6745d1786d927fab06db40524448
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml b/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml
new file mode 100644
index 0000000..d105dd3
--- /dev/null
+++ b/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml
@@ -0,0 +1,26 @@
+description: >
+    Implement to provide item physical asset attributes.
+properties:
+    - name: PartNumber
+      type: string
+      description: >
+          The item part number, typically a stocking number.
+    - name: SerialNumber
+      type: string
+      description: >
+          The item serial number.
+    - name: Manufacturer
+      type: string
+      description: >
+          The item manufacturer.
+    - name: BuildDate
+      type: string
+      description: >
+          The date of item manufacture in
+          YYYYMMDD format.
+    - name: Model
+      type: string
+      description: >
+          The model of the item.
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4