Use crashing process' UID and PID, rather than Binder caller.

Binder.callingUid() works for Java crashes as the caller is the crashing
app itself. However, in the case of native crashes, it is not, resulting
in UID = 1000, which is not at all helpful.

Test: atest
Change-Id: Ife1645af03108ca3ee72e6fc5faa4319eb8917e8
Bug: 177898567