Fix testRestart

Booting takes slightly longer on user devices, causing the ttl for the
metric activation to run out before the device finishes booting.

Bug: 160208381
Test: atest android.cts.statsd.metric.MetricActivationTests#testRestart
Change-Id: Ie6708fadf5390eeb828b05dce06c34a99a42e52d
1 file changed