allow thermald to read sysfs battery info

Addresses:
avc: denied { getattr } forpath="/sys/devices/f9925000.i2c/i2c-0/0-001c/power_supply/battery/capacity" dev="sysfs" ino=17963 scontext=u:r:thermald:s0 tcontext=u:object_r:sysfs_batteryinfo:s0 tclass=file
avc: denied { read } for name="capacity" dev="sysfs" ino=17963 scontext=u:r:thermald:s0 tcontext=u:object_r:sysfs_batteryinfo:s0 tclass=file
avc: denied { open } for path="/sys/devices/f9925000.i2c/i2c-0/0-001c/power_supply/battery/capacity" dev="sysfs" ino=17963 scontext=u:r:thermald:s0 tcontext=u:object_r:sysfs_batteryinfo:s0 tclass=file

Change-Id: I63e85a747b452f3c12eb65cd7538ee34d7760eaa
diff --git a/sepolicy/thermald.te b/sepolicy/thermald.te
index 337f55f..ecf5f33 100644
--- a/sepolicy/thermald.te
+++ b/sepolicy/thermald.te
@@ -27,3 +27,4 @@
 
 # TODO specify specific labels for /sys/ files
 allow thermald sysfs:file write;
+allow thermald sysfs_batteryinfo:file r_file_perms;