Enable displayio on all Express boards.

Author: tannewt

ports/atmel-samd/mpconfigport.h

@@ -283,13 +283,9 @@ extern const struct _mp_obj_module_t pixelbuf_module;
         #define I2CSLAVE_MODULE
     #endif
 
-    #ifdef CIRCUITPY_DISPLAYIO
+    #define CIRCUITPY_DISPLAYIO (1)
     #define CIRCUITPY_DISPLAY_LIMIT (3)
 	#define DISPLAYIO_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_displayio), (mp_obj_t)&displayio_module },
-    #else
-    #define CIRCUITPY_DISPLAY_LIMIT (0)
-	#define DISPLAYIO_MODULE
-    #endif
 
     #if MICROPY_PY_NETWORK
         #define NETWORK_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_network), (mp_obj_t)&network_module },