py/mpconfig: Don't define MICROPY_PY_IO_BYTESIO if no MICROPY_PY_IO.
Just use `#define MICROPY_PY_IO_BYTESIO (MICROPY_PY_IO)` as already used
in few other places.
@@ -1139,7 +1139,7 @@ typedef double mp_float_t;
// Whether to provide "io.BytesIO" class
#ifndef MICROPY_PY_IO_BYTESIO
-#define MICROPY_PY_IO_BYTESIO (1)
+#define MICROPY_PY_IO_BYTESIO (MICROPY_PY_IO)
#endif
// Whether to provide "io.BufferedWriter" class
