bootstat: Record the time since factory reset on init.

Bug: 25448351
Change-Id: I71905a598e74f41c18a96d469c7a6ddd5a2e07fb
(cherry picked from commit 53684ea625b9cff34f9cdb2d4bae4cd25538ca3b)
diff --git a/bootstat/bootstat.rc b/bootstat/bootstat.rc
index 218b9f8..13ef27e 100644
--- a/bootstat/bootstat.rc
+++ b/bootstat/bootstat.rc
@@ -13,5 +13,8 @@
     # Record the boot reason.
     exec - root root -- /system/bin/bootstat --record_boot_reason
 
+    # Record time since factory reset.
+    exec - root root -- /system/bin/bootstat --record_time_since_factory_reset
+
     # Log all boot events.
     exec - root root -- /system/bin/bootstat -l