Allow init to rm /dev/diag

Commit 456d9d6c4b50f39fdd176bafd2ae007c047f352c ensures that
/dev/diag is always removed on boot on user builds. Allow for it
in SELinux policy.

Change-Id: Ib4748705b9aeb089ed461888da8d57f37bc0d62a
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 0d8c58f..00cb314 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -117,6 +117,7 @@
         domain.te \
         file.te \
         gsiffd.te \
+        init.te \
         irsc_util.te \
         mdm_helper.te \
         mediaserver.te \
diff --git a/sepolicy/init.te b/sepolicy/init.te
new file mode 100644
index 0000000..14f1b92
--- /dev/null
+++ b/sepolicy/init.te
@@ -0,0 +1 @@
+allow init diag_device:chr_file unlink;