health-metric: add dbus path for total cpu

Add the DBus path for total CPU to be used in phosphor-health-monitor.

Change-Id: Id50d84c7cdc96e723575db591a3d97d052d016bb
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/yaml/xyz/openbmc_project/Metric/Value.interface.yaml b/yaml/xyz/openbmc_project/Metric/Value.interface.yaml
index 7fb491a..b00538f 100644
--- a/yaml/xyz/openbmc_project/Metric/Value.interface.yaml
+++ b/yaml/xyz/openbmc_project/Metric/Value.interface.yaml
@@ -89,6 +89,10 @@
             description: >
                 The user CPU utilization.
             value: cpu/user
+          - name: TotalCPU
+            description: >
+                The total CPU utilization.
+            value: cpu/total
           - name: ReadWriteStorage
             description: >
                 The available read write storage.