Create directory for caching odrefresh metrics

Metrics are written to /data/misc/odrefresh by odrefresh during early
boot, then the zygote passes them to statsd and delete the metrics
files.

Bug: 169925964
Test: manual
Change-Id: Ia39098109d59600ae8d7b197f46e9a6de18ca57c
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 9a30ead..a702375 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -755,6 +755,8 @@
     mkdir /data/misc/snapshotctl_log 0755 root root
     # create location to store pre-reboot information
     mkdir /data/misc/prereboot 0700 system system
+    # directory used for on-device refresh metrics file.
+    mkdir /data/misc/odrefresh 0777 system system
     # directory used for on-device signing key blob
     mkdir /data/misc/odsign 0700 root root