android boottime2: improvement on avoiding bad case

there are the cases that service like bootanim or surfaceflinger
was started more than once, and this case will make confusion
for getting average information, so check this case first,
and report error when found such cases

Change-Id: I23f158847c371dae56155d53affbf298c43e41a4
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>

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