Add Staged to activation

Staged in Activations yaml is added to denote the firmware image
that is being written to flash staging area as part of
firmware update process which will be moved to Active upon reset.

Change-Id: I0d46206463ba566bcaa710fb271aa4d795fa49cd
Signed-off-by: Vikram Bodireddy <vikram.bodireddy@linux.intel.com>
diff --git a/xyz/openbmc_project/Software/Activation.interface.yaml b/xyz/openbmc_project/Software/Activation.interface.yaml
index 37c9cb9..efeeeb6 100644
--- a/xyz/openbmc_project/Software/Activation.interface.yaml
+++ b/xyz/openbmc_project/Software/Activation.interface.yaml
@@ -34,6 +34,10 @@
         - name: Failed
           description: >
             The Software.Version failed during or after Activation.
+        - name: Staged
+          description: >
+            The Software.Version is currently in staged flash area.
+            This is moved from staged flash area to active upon reset.
     - name: RequestedActivations
       description: >
         The possible RequestedActivation states of a Software.Version.