Prevent developer provided strings from being uploaded through statsd.

 - in situation when developer provides message when op is noted, do not
report it through stack trace collection infrastructure
 - collect only statcktraces for OP_FLAG_SELF and OP_FLAG_TRUSTED_PROXIED to
match collection of appops counts

Test: atest  android.app.appops.cts.RuntimeMessageCollectionTest
Fixes: 159433071
Change-Id: I1ab56a530832873a1f1f68aba5ab6eabc9e8a17a