Add event log for log cleared

-Create log on d-bus when user cleared all log entries.

Tested: tested and verified the implementation on greatlakes platform.
-Call method DeleteAll and check the d-bus path for event log.

Change-Id: Ib0e71b014608a25cc17bd803768b53774b8f4539
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
diff --git a/yaml/xyz/openbmc_project/Logging.metadata.yaml b/yaml/xyz/openbmc_project/Logging.metadata.yaml
new file mode 100644
index 0000000..99d647a
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Logging.metadata.yaml
@@ -0,0 +1,5 @@
+- name: LogsCleared
+  level: INFO
+  meta:
+      - str: "NUM_LOGS=%u"
+        type: size_t