Add odrefresh_data_file for odrefresh metrics

Metrics are written to /data/misc/odrefresh by odrefresh during early
boot, then native code in ART system_server initialization passes them
to statsd and deletes the metrics files. This hand-off is necessary
because statsd does not start until after odsign and odrefresh have run.

Bug: 169925964
Test: manual
Change-Id: I8054519a714907819886dd6e5e78f3b5796d0898
diff --git a/private/file_contexts b/private/file_contexts
index 3786147..6a5fc60 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -599,6 +599,7 @@
 /data/misc/net(/.*)?            u:object_r:net_data_file:s0
 /data/misc/network_watchlist(/.*)? u:object_r:network_watchlist_data_file:s0
 /data/misc/nfc/logs(/.*)?       u:object_r:nfc_logs_data_file:s0
+/data/misc/odrefresh(/.*)?      u:object_r:odrefresh_data_file:s0
 /data/misc/odsign(/.*)?         u:object_r:odsign_data_file:s0
 /data/misc/perfetto-traces/bugreport(.*)? u:object_r:perfetto_traces_bugreport_data_file:s0
 /data/misc/perfetto-traces(/.*)?          u:object_r:perfetto_traces_data_file:s0