Use autogenerated SysUiStatsLog for statsd logging

StatsLogCompat is not needed because we can autogenerate StatsLog write
calls that are public. This CL switches uses of StatsLogCompat to using
SysUiStatsLog from SystemUI.

Bug: 145952197
Test: m
Test: fastboot flashall
Test: adb shell cmd stats print-logs && adb logcat "*:S statsd:*" and
inspect LAUNCHER_EVENT logging

Change-Id: Ib4f90a79f436cdd7e058fdb7027c09a5a59cc4f9