Logging.Entry: Add 'AdditionalData2' as a dict of metadata

In order to ease transition from vector to dict, add a new property
for the time being.  Existing code can transition to using the dict
and then we can rename the property once everyone has moved to the
dict format.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4c918cb25021fd5434f6a50da7bbe3e0b2c2a4fb
diff --git a/yaml/xyz/openbmc_project/Logging/Entry.interface.yaml b/yaml/xyz/openbmc_project/Logging/Entry.interface.yaml
index 3c0dd51..459809f 100644
--- a/yaml/xyz/openbmc_project/Logging/Entry.interface.yaml
+++ b/yaml/xyz/openbmc_project/Logging/Entry.interface.yaml
@@ -34,6 +34,10 @@
       type: array[string]
       description: >
           Additional information in the form of metadata field strings VAR=val
+    - name: AdditionalData2
+      type: dict[string, string]
+      description: >
+          Additional information in the form of metadata field strings {VAR,val}
     - name: Resolution
       type: string
       description: >