Add label for /proc/sys/vm/page-cluster

Test: boot sailfish with no audit when writing to page-cluster
Change-Id: I2bfebdf9342594d66d95daaec92d71195c93ffc8
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 124da42..a6de59a 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -40,6 +40,7 @@
 genfscon proc /sys/vm/mmap_min_addr u:object_r:proc_security:s0
 genfscon proc /sys/vm/mmap_rnd_bits u:object_r:proc_security:s0
 genfscon proc /sys/vm/mmap_rnd_compat_bits u:object_r:proc_security:s0
+genfscon proc /sys/vm/page-cluster u:object_r:proc_page_cluster:s0
 genfscon proc /sys/vm/drop_caches u:object_r:proc_drop_caches:s0
 genfscon proc /sys/vm/overcommit_memory u:object_r:proc_overcommit_memory:s0
 genfscon proc /timer_list u:object_r:proc_timer:s0