Changes in SELinux Policy for CSS API

Bug: 309657924
Change-Id: If8717cdf4483c3b116053c952b9da1ad4670244a
Test: manual verification ($ adb shell service list)
diff --git a/private/service_contexts b/private/service_contexts
index 3b088bf..2473733 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -201,6 +201,7 @@
 content_capture                           u:object_r:content_capture_service:s0
 content_suggestions                       u:object_r:content_suggestions_service:s0
 contexthub                                u:object_r:contexthub_service:s0
+contextual_search                         u:object_r:contextual_search_service:s0
 country_detector                          u:object_r:country_detector_service:s0
 coverage                                  u:object_r:coverage_service:s0
 cpuinfo                                   u:object_r:cpuinfo_service:s0