Expose the update engine function GetEolStatus to dbus client

Chrome side will use this method to check the end of life status of
the device and show notifications corresponding to each status.

TEST=chrome compile

Change-Id: I237caaaebe60c9ddc72d111a545a612f8d7e676a
Reviewed-on: https://chromium-review.googlesource.com/350874
Commit-Ready: Xiaoyin Hu <xiaoyinh@chromium.org>
Tested-by: Xiaoyin Hu <xiaoyinh@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed