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: No mergepath to AOSP.
Bug: 188590587
Test: statsd TestDrive script.
Merged-In: I31d202751ba78bb547822020260a7e366cb8826e

Change-Id: I31d202751ba78bb547822020260a7e366cb8826e
diff --git a/private/property.te b/private/property.te
index d6ddbdf..49d18ee 100644
--- a/private/property.te
+++ b/private/property.te
@@ -16,6 +16,7 @@
 system_internal_prop(init_perf_lsm_hooks_prop)
 system_internal_prop(init_service_status_private_prop)
 system_internal_prop(init_svc_debug_prop)
+system_internal_prop(keystore_crash_prop)
 system_internal_prop(keystore_listen_prop)
 system_internal_prop(last_boot_reason_prop)
 system_internal_prop(localization_prop)