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: Iaa2db34a7be4c3215f62cc36661ba8ac81656baa