Add a logo to the fastbootd screen.

fastbootd looks too much like recovery, even if you're carefully reading
the menu. It's not obvious the device is in a flashing mode, and it's
too tempting to reboot or unplug the device in this state.

As a first step, this patch adds a big red "fastbootd" logo so it's less
obviously in recovery mode.

Bug: 120429730
Test: manual test
Change-Id: I73359f1fdfdc0b1694993f760fe7f35c5713b24e
diff --git a/screen_ui.h b/screen_ui.h
index acd44c8..5cda2a2 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -345,6 +345,8 @@
   std::unique_ptr<GRSurface> wipe_data_confirmation_text_;
   std::unique_ptr<GRSurface> wipe_data_menu_header_text_;
 
+  std::unique_ptr<GRSurface> fastbootd_logo_;
+
   // current_icon_ points to one of the frames in intro_frames_ or loop_frames_, indexed by
   // current_frame_, or error_icon_.
   Icon current_icon_;