Revert "add heltec_v4 tft expansion box"

This reverts commit 310618e689.

variants/heltec_v4/target.cpp

@@ -24,7 +24,7 @@ AutoDiscoverRTCClock rtc_clock(fallback_clock);
 #endif
 
 #ifdef DISPLAY_CLASS
-  DISPLAY_CLASS display(&(board.periph_power));
+  DISPLAY_CLASS display;
   MomentaryButton user_btn(PIN_USER_BTN, 1000, true);
 #endif