Allow system to search the /sys/devices/system/cpu directory.

Change-Id: Iaa8fb6fa8726d083ee3c49edbbd398f0e8f33a37
diff --git a/system.te b/system.te
index 9d6d4c1..0adbd2d 100644
--- a/system.te
+++ b/system.te
@@ -216,3 +216,6 @@
 
 # Allow system to talk to sensors
 allow system sensors_device:chr_file rw_file_perms;
+
+# Allow system to search the /sys/devices/system/cpu directory
+allow system sysfs_devices_system_cpu:dir search;