rootdir: access to pstore denied to bootstat

Test: boot_reason_test.sh
Bug: 110925971
Change-Id: Iba7b7325fe8c9ad18a7f8dbda550d6008400693e
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 197047d..625ffba 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -227,6 +227,8 @@
 
     # pstore/ramoops previous console log
     mount pstore pstore /sys/fs/pstore nodev noexec nosuid
+    chown system log /sys/fs/pstore
+    chmod 0550 /sys/fs/pstore
     chown system log /sys/fs/pstore/console-ramoops
     chmod 0440 /sys/fs/pstore/console-ramoops
     chown system log /sys/fs/pstore/console-ramoops-0