minui: Add API to support multiple connectors detection

Add API to support multiple connectors detection

Bug: 227468133
Test: check log in recovery mode
Change-Id: I18c5e0f373a29b153aab038bd289eed18847f2af
diff --git a/minui/graphics_fbdev.h b/minui/graphics_fbdev.h
index 7e193c4..c772428 100644
--- a/minui/graphics_fbdev.h
+++ b/minui/graphics_fbdev.h
@@ -57,6 +57,7 @@
   GRSurface* Flip() override;
   void Blank(bool) override;
   void Blank(bool blank, DrmConnector index) override;
+  bool HasMultipleConnectors() override;
 
  private:
   void SetDisplayedFramebuffer(size_t n);