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-b

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>

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