[Tether15] Allow system app to find TetheringManager

Bug: 144320246
Test: -build, flash, boot
      -OFF/ON hotspot

Change-Id: I8ce7ac5eb8198f0df4a2da426e3c56e8915e746a
diff --git a/private/platform_app.te b/private/platform_app.te
index 45de3cb..72bfe71 100644
--- a/private/platform_app.te
+++ b/private/platform_app.te
@@ -68,6 +68,7 @@
 allow platform_app vr_manager_service:service_manager find;
 allow platform_app gpu_service:service_manager find;
 allow platform_app stats_service:service_manager find;
+allow platform_app tethering_service:service_manager find;
 userdebug_or_eng(`
   allow platform_app platform_compat_service:service_manager find;
 ')