Add SEPolicy for new Java-based Broadcast Radio service.

Bug: b/36863239
Test: manual
Change-Id: I7e929926efbb1570ea9723ef3810a511c71dc11a
(cherry picked from commit 38f0928fb05793b91651ba9787e4da8c2cd5afd3)
diff --git a/private/service_contexts b/private/service_contexts
index 8a4650e..1543fda 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -16,6 +16,7 @@
 battery                                   u:object_r:battery_service:s0
 bluetooth_manager                         u:object_r:bluetooth_manager_service:s0
 bluetooth                                 u:object_r:bluetooth_service:s0
+broadcastradio                            u:object_r:broadcastradio_service:s0
 carrier_config                            u:object_r:radio_service:s0
 clipboard                                 u:object_r:clipboard_service:s0
 com.android.net.IProxyService             u:object_r:IProxyService_service:s0