SF: Add DisplayDevice::getDebugName()

Bug: 74619554
Test: dumpsys SurfaceFlinger
Change-Id: Ic3c672edebd0ff7a788c2ab0b3baae1287dffdba
diff --git a/services/surfaceflinger/DisplayDevice.h b/services/surfaceflinger/DisplayDevice.h
index 918f7de..152d0ec 100644
--- a/services/surfaceflinger/DisplayDevice.h
+++ b/services/surfaceflinger/DisplayDevice.h
@@ -203,6 +203,7 @@
      * Debugging
      */
     uint32_t getPageFlipCount() const;
+    std::string getDebugName() const;
     void dump(String8& result) const;
 
 private: