SF: add first trunk-stable flag

Bug: 297389311
Test: presubmit
Change-Id: I4c76676076779b4c641635bbecb9f77e0fdde51c
diff --git a/services/surfaceflinger/surfaceflinger_flags.aconfig b/services/surfaceflinger/surfaceflinger_flags.aconfig
new file mode 100644
index 0000000..0a36888
--- /dev/null
+++ b/services/surfaceflinger/surfaceflinger_flags.aconfig
@@ -0,0 +1,9 @@
+package: "com.android.graphics.surfaceflinger.flags"
+
+flag {
+  name: "misc1"
+  namespace: "core_graphics"
+  description: "This flag controls minor miscellaneous SurfaceFlinger changes"
+  bug: "297389311"
+  is_fixed_read_only: true
+}
\ No newline at end of file