Allow child layers to unset trusted overlay state 2/2

Test: presubmit
Bug: 339701674
Change-Id: I1a94b5e5dc1fa64a9e1eb3330b5c5b03af8d2b16
diff --git a/services/surfaceflinger/common/FlagManager.cpp b/services/surfaceflinger/common/FlagManager.cpp
index 121629f..57b170f 100644
--- a/services/surfaceflinger/common/FlagManager.cpp
+++ b/services/surfaceflinger/common/FlagManager.cpp
@@ -147,6 +147,7 @@
     DUMP_READ_ONLY_FLAG(detached_mirror);
     DUMP_READ_ONLY_FLAG(commit_not_composited);
     DUMP_READ_ONLY_FLAG(local_tonemap_screenshots);
+    DUMP_READ_ONLY_FLAG(override_trusted_overlay);
 
 #undef DUMP_READ_ONLY_FLAG
 #undef DUMP_SERVER_FLAG
@@ -244,6 +245,7 @@
 FLAG_MANAGER_READ_ONLY_FLAG(detached_mirror, "");
 FLAG_MANAGER_READ_ONLY_FLAG(commit_not_composited, "");
 FLAG_MANAGER_READ_ONLY_FLAG(local_tonemap_screenshots, "debug.sf.local_tonemap_screenshots");
+FLAG_MANAGER_READ_ONLY_FLAG(override_trusted_overlay, "");
 
 /// Trunk stable server flags ///
 FLAG_MANAGER_SERVER_FLAG(refresh_rate_overlay_on_external_display, "")