Use FrameworkStatsLog instead of StatsLog

As part of statsd becoming a Mainline module in R, autogenerated
StatsLog.write() calls are going away and replaced by *StatsLog.java
that is autogenerated for each module.
This CL replaces some usages of StatsLog with FrameworkStatsLog.

Bug: 145952197
Test: m
Change-Id: Id3e0900a050441b9aef3ee6244759f5098afdfb1