Add a new system service "blob_store".

Bug: 143559646
Test: manual
Change-Id: Id13566e9efc815f4a6ebb7228a1145aa91d6d526
diff --git a/private/service_contexts b/private/service_contexts
index defdfa4..12206ea 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -10,6 +10,7 @@
 app_binding                               u:object_r:app_binding_service:s0
 app_prediction                            u:object_r:app_prediction_service:s0
 apexservice                               u:object_r:apex_service:s0
+blob_store                                u:object_r:blob_store_service:s0
 gsiservice                                u:object_r:gsi_service:s0
 appops                                    u:object_r:appops_service:s0
 appwidget                                 u:object_r:appwidget_service:s0