sepolicy: enable wakeup_sources debugfs for system_app

for wakelocks

Change-Id: I49b19231db6e5fe74c5c94bb9006e67049f90741
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index e8d6201..a69449a 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -22,3 +22,6 @@
 # fsck
 /system/bin/fsck\.ntfs                          u:object_r:fsck_exec:s0
 /system/bin/mount\.exfat                         u:object_r:fsck_exec:s0
+
+# wakelocks
+/sys/kernel/debug/wakeup_source     u:object_r:debugsfs_wakelock:s0