Add /dev/diag support in policy.

Change-Id: Ife106263a39501959f9779c601dfbe17d5854c3f
diff --git a/sepolicy/device.te b/sepolicy/device.te
index 98d57c3..b997573 100644
--- a/sepolicy/device.te
+++ b/sepolicy/device.te
@@ -2,3 +2,4 @@
 type elan_ip_device, dev_type;
 type sensors_block_device, dev_type;
 type sysfs_devices_tegradc, dev_type;
+type diag_device, dev_type;