Allow recovery to read thermal info on sailfish

Encountered more denials on sailfish:

avc:  denied  { read } for  pid=439 comm="recovery" name="thermal"
dev="sysfs" ino=28516 scontext=u:r:recovery:s0
tcontext=u:object_r:sysfs_thermal:s0 tclass=dir permissive=0

avc:  denied  { read } for  pid=441 comm="recovery"
name="thermal_zone9" dev="sysfs" ino=40364 scontext=u:r:recovery:s0
tcontext=u:object_r:sysfs_thermal:s0 tclass=lnk_file permissive=0

Bug: 36920500
Test: sideload a package in sailfish
Change-Id: Ib4e89ba48cdc383318e5f3b7b15f542434e43564
diff --git a/public/recovery.te b/public/recovery.te
index 6bbc2ab..1f1a5ac 100644
--- a/public/recovery.te
+++ b/public/recovery.te
@@ -91,8 +91,7 @@
   allow recovery { cache_file cache_recovery_file }:file create_file_perms;
 
   # Read /sys/class/thermal/*/temp for thermal info.
-  allow recovery sysfs_thermal:dir search;
-  allow recovery sysfs_thermal:file r_file_perms;
+  r_dir_file(recovery, sysfs_thermal)
 
   # Read files on /oem.
   r_dir_file(recovery, oemfs);