Change SELinux policy for speech recognizer.

Bug: 176578753
Test: manual verification ($ adb shell service list)
Change-Id: I3ebf6f5d45d65578b2eaf7efac073731afd10a58
diff --git a/private/service_contexts b/private/service_contexts
index 0b027ed..aea7100 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -223,6 +223,7 @@
 sip                                       u:object_r:radio_service:s0
 slice                                     u:object_r:slice_service:s0
 smartspace                                u:object_r:smartspace_service:s0
+speech_recognition                        u:object_r:speech_recognition_service:s0
 stats                                     u:object_r:stats_service:s0
 statscompanion                            u:object_r:statscompanion_service:s0
 statsmanager                              u:object_r:statsmanager_service:s0