hwc2: Add support for dynamic resolution switch

CRs-Fixed: 2076226
Change-Id: Ib7c6c6a56055d27b6db43e828760059d553d59c2
diff --git a/sdm/libs/hwc2/hwc_display.h b/sdm/libs/hwc2/hwc_display.h
index b70f160..e773e91 100644
--- a/sdm/libs/hwc2/hwc_display.h
+++ b/sdm/libs/hwc2/hwc_display.h
@@ -299,6 +299,7 @@
   bool color_tranform_failed_ = false;
   HWCColorMode *color_mode_ = NULL;
   HWCToneMapper *tone_mapper_ = nullptr;
+  uint32_t num_configs_ = 0;
   int disable_hdr_handling_ = 0;  // disables HDR handling.
 
  private: