SF: add traces for latch unsignled

Add more debug information to traces to determine SF would
not try to latch an unsignaled buffer.

Test: manual
Bug: 285901173
Change-Id: I60a19fe889ce7c052ea4f3fc8f10771494d330aa
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index f7596e2..f34fdd9 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -866,7 +866,7 @@
     std::string getPendingBufferCounterName() { return mBlastTransactionName; }
     bool updateGeometry();
 
-    bool simpleBufferUpdate(const layer_state_t&) const;
+    bool isSimpleBufferUpdate(const layer_state_t& s) const;
 
     static bool isOpaqueFormat(PixelFormat format);