Allow Perfetto to log to statsd

Denial:
10-31 21:17:11.150  8148  8148 W perfetto: type=1400 audit(0.0:135): avc: denied { write } for name="statsdw" dev="tmpfs" ino=33205 scontext=u:r:perfetto:s0 tcontext=u:object_r:statsdw_socket:s0 tclass=sock_file permissive=0

Bug: b/139351286
Test: adb shell perfetto -c :test --dropbox perfetto, watch logcat
  for denials
Change-Id: I401f1625212f85831ce54116271752578db29578
1 file changed