init: add log w/ service PID

We could combine this with the existing log, but I
wouldn't want to make that appear later.

Ironically, adding this log to try to reduce logs.

Bug: 36785118
Test: :) adb logcat -d | grep "started service" | wc -l
131

Change-Id: I38f4e9740871aa256eef0c62e897038eb46871a5