include digitalio header where actually needed

Author: jepler

shared-module/epaperdisplay/EPaperDisplay.h

@@ -31,6 +31,7 @@
 #include "shared-module/displayio/area.h"
 #include "shared-module/displayio/bus_core.h"
 #include "shared-module/displayio/display_core.h"
+#include "common-hal/digitalio/DigitalInOut.h"
 
 typedef struct {
     mp_obj_base_t base;