FTDI/EVE, pins cleanup for SKR E3/DIP (#17990)

Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/pin_mappings.h

@@ -154,12 +154,3 @@
     #define CLCD_SPI_EXTRA_CS            SDSS
   #endif
 #endif
-
-#if EITHER(E3_EXP1_PINMAP, GENERIC_EXP2_PINMAP)
-  #ifndef __MARLIN_FIRMWARE__
-    #error "This pin mapping requires Marlin."
-  #endif
-
-  #define CLCD_MOD_RESET                 BTN_EN1
-  #define CLCD_SPI_CS                    LCD_PINS_RS
-#endif