Add sepolicy for background_install_control service

The background_install_control service is going to detect
background installed apps and provide the list of such apps.

Bug: 244216300
Test: manual
Change-Id: I6500f29ee063da4a3bc18e109260de419dd39218
diff --git a/private/service_contexts b/private/service_contexts
index beeabbd..b083972 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -134,6 +134,7 @@
 audio                                     u:object_r:audio_service:s0
 auth                                      u:object_r:auth_service:s0
 autofill                                  u:object_r:autofill_service:s0
+background_install_control                u:object_r:bg_install_control_service:s0
 backup                                    u:object_r:backup_service:s0
 batteryproperties                         u:object_r:batteryproperties_service:s0
 batterystats                              u:object_r:batterystats_service:s0