SF: add a server writable flag (non boot stable)

Bug: 297389311
Test: presubmit
Change-Id: I35cd5b7dd6160bcc45873eafae35c7497539fe56
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 59b1172..0f98cb1 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -1454,6 +1454,8 @@
     // Trunk-Stable flags
     bool mMiscFlagValue;
     bool mConnectedDisplayFlagValue;
+    bool mMisc2FlagEarlyBootValue;
+    bool mMisc2FlagLateBootValue;
 };
 
 class SurfaceComposerAIDL : public gui::BnSurfaceComposer {