display: Add support to query Display HW Id

Add support to query Display HW Id from HWC HAL of a given display.

CRs-Fixed: 2710899
Change-Id: I96e9cfe4f8f75b0c1cd23adab23e7abd2707ff59
diff --git a/services/config/config_defs.h b/services/config/config_defs.h
index c4181b8..4f4ef92 100644
--- a/services/config/config_defs.h
+++ b/services/config/config_defs.h
@@ -295,6 +295,7 @@
   virtual int IsRotatorSupportedFormat(int hal_format, bool ubwc, bool *supported) DEFAULT_RET
   virtual int ControlQsyncCallback(bool enable) DEFAULT_RET
   virtual int SendTUIEvent(DisplayType dpy, TUIEventType event_type) DEFAULT_RET
+  virtual int GetDisplayHwId(uint32_t disp_id, uint32_t *display_hw_id) DEFAULT_RET
 
   // deprecated APIs
   virtual int GetDebugProperty(const std::string prop_name, std::string value) DEFAULT_RET