Allow keystore to read and write keystore.crash_count system property.

Additionally, remove the obsolete permission which allows keystore to
register callbacks with statsd. There's no direct communication between
keystore and statsd now.

Ignore-AOSP-First: Resolving merge conflicts.
Bug: 188590587
Test: statsd TestDrive script.
Merged-In: I31d202751ba78bb547822020260a7e366cb8826e

Change-Id: I31d202751ba78bb547822020260a7e366cb8826e
6 files changed