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: I7d92b833937037e075c7e53401367061901b3a6e