PEL.Entry - Support ManagementSystemAck property

This property is used to keep track of the management system
acknowledging the PEL. In IBM systems this property is used by HMC to
ack PEL and report back if its processed such that the same PEL is not
sent again.

Signed-off-by: Vijay Lobo <vijaylobo@gmail.com>
Change-Id: Iedb27e843f731df7c871c24945eb8cd8679e63d1
diff --git a/yaml/org/open_power/Logging/PEL/Entry.interface.yaml b/yaml/org/open_power/Logging/PEL/Entry.interface.yaml
index 0ea6ba9..8a91d10 100644
--- a/yaml/org/open_power/Logging/PEL/Entry.interface.yaml
+++ b/yaml/org/open_power/Logging/PEL/Entry.interface.yaml
@@ -19,3 +19,9 @@
         A free form, implementation defined string which uniquely and
         permanently identifies a specific subsystem string. This field should
         not be used for programmatic interrogation of an object.
+    - name: ManagementSystemAck
+      type: boolean
+      default: false
+      description: >
+        Notifies the PEL handler that the management system acknowledged a PEL.
+        The management system can be any system monitoring the hardware.
\ No newline at end of file