Define policy for new StorageStatsManager API.

Test: builds
Bug: 32206268
Change-Id: I236105b029178f96da519c2295c66c686dcae7cb

private/service_contexts

@@ -134,6 +134,7 @@ sip                                       u:object_r:radio_service:s0
 soundtrigger                              u:object_r:voiceinteraction_service:s0
 statusbar                                 u:object_r:statusbar_service:s0
 storaged                                  u:object_r:storaged_service:s0
+storagestats                              u:object_r:storagestats_service:s0
 SurfaceFlinger                            u:object_r:surfaceflinger_service:s0
 task                                      u:object_r:task_service:s0
 telecom                                   u:object_r:telecom_service:s0

public/service.te

@@ -113,6 +113,7 @@ type servicediscovery_service, app_api_service, system_server_service, service_m
 type settings_service, app_api_service, system_server_service, service_manager_type;
 type shortcut_service, app_api_service, system_server_service, service_manager_type;
 type statusbar_service, app_api_service, system_server_service, service_manager_type;
+type storagestats_service, app_api_service, system_server_service, service_manager_type;
 type task_service, system_server_service, service_manager_type;
 type textservices_service, app_api_service, system_server_service, service_manager_type;
 type telecom_service, app_api_service, system_server_service, service_manager_type;