Migrate to TelephonyStatsLog from 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 adds autogenerated TelephonylStatsLog and replaces usages
of StatsLog with TelephonyStatsLog.

Bug: 145952197
Test: m
Change-Id: I7d926a3f3650240e82bfab2bbc17ff6ce6af52cc