Allow binder services to r/w su:tcp_socket

Test: binderHostDeviceTest
Bug: 182914638
Change-Id: I1c8d3b2194bc20bd2bcde566190aa5c73d7e7db9
diff --git a/private/mediatranscoding.te b/private/mediatranscoding.te
index 2a43cf9..d812525 100644
--- a/private/mediatranscoding.te
+++ b/private/mediatranscoding.te
@@ -61,4 +61,5 @@
 # permissions and be isolated from the rest of the system and network.
 # Lengthier explanation here:
 # https://android-developers.googleblog.com/2016/05/hardening-media-stack.html
-neverallow mediatranscoding domain:{ tcp_socket udp_socket rawip_socket } *;
+neverallow mediatranscoding domain:{ udp_socket rawip_socket } *;
+neverallow mediatranscoding { domain userdebug_or_eng(`-su') }:tcp_socket *;