charger: fix secondary display not turning off after first display was off

turn off both display after first display was turned off

Bug: 242967285
Test: charging animation can show in display correctly
Signed-off-by: Jack Wu <wjack@google.com>
Change-Id: Ie5741b49322aaf8a3750b1977fb203e4d0df3539
diff --git a/healthd/healthd_draw.h b/healthd/healthd_draw.h
index 3d4abbd..016db8e 100644
--- a/healthd/healthd_draw.h
+++ b/healthd/healthd_draw.h
@@ -38,6 +38,9 @@
   // Rotate screen.
   virtual void rotate_screen(int drm);
 
+  // Detect dual display
+  virtual bool has_multiple_connectors();
+
   static std::unique_ptr<HealthdDraw> Create(animation *anim);
 
  protected: