Enable LCD_PIN_RESET if it exists (PR#2375)

Marlin/dogm_lcd_implementation.h

@@ -197,6 +197,11 @@ static void lcd_implementation_init() {
 	  digitalWrite(LCD_PIN_BL, HIGH);
   #endif
 
+  #ifdef LCD_PIN_RESET
+    pinMode(LCD_PIN_RESET, OUTPUT);           
+    digitalWrite(LCD_PIN_RESET, HIGH);
+  #endif
+
   u8g.setContrast(lcd_contrast);	
 	// FIXME: remove this workaround
   // Uncomment this if you have the first generation (V1.10) of STBs board