Enable recovery to read batteryinfo.

Bug: 26879394

Change-Id: I09ac9027ca343e00488dedab8df1687fd32bb255
diff --git a/recovery.te b/recovery.te
index afacf40..d5767ed 100644
--- a/recovery.te
+++ b/recovery.te
@@ -48,6 +48,8 @@
   # TODO: create more specific label?
   allow recovery sysfs:file w_file_perms;
 
+  allow recovery sysfs_batteryinfo:file r_file_perms;
+
   allow recovery kernel:system syslog_read;
 
   # Access /dev/android_adb or /dev/usb-ffs/adb/ep0