sepolicy: Fix init denials

init.local.rc(a.k.a. init.omni.rc on-device) needs to write disk
schedulers.
It also wants mount debugfs, but only allow that on debug builds.

avc: denied { mounton } for comm="init" path="/sys/kernel/debug" \
  dev="debugfs" ino=1 scontext=u:r:init:s0 tcontext=u:object_r:debugfs:s0 tclass=dir
avc: denied { setattr } for name="scheduler" dev="sysfs" ino=45146 \
  scontext=u:r:init:s0 tcontext=u:object_r:sysfs:s0 tclass=file

Change-Id: I68e8dd982504c4673947d73119fa342f7fcd943b
diff --git a/sepolicy/private/file_contexts b/sepolicy/private/file_contexts
index 40295bb..b62ada7 100644
--- a/sepolicy/private/file_contexts
+++ b/sepolicy/private/file_contexts
@@ -2,3 +2,6 @@
 /system/bin/backuptool_ab\.functions              u:object_r:otapreopt_chroot_exec:s0
 /system/bin/backuptool_ab\.sh                     u:object_r:otapreopt_chroot_exec:s0
 /system/bin/backuptool_postinstall\.sh            u:object_r:otapreopt_chroot_exec:s0
+
+# Set disk scheduler via init
+/sys/block/[^/]+/queue/scheduler                   u:object_r:sysfs_block_scheduler:s0