cc3200/mods/pybspi: Allow "write" arg of read/readinto to be positional.

To conform with Hardware API.

cc3200/mods/pybspi.c

@@ -295,7 +295,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_spi_write_obj, pyb_spi_write);
 STATIC mp_obj_t pyb_spi_read(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_nbytes,    MP_ARG_REQUIRED | MP_ARG_OBJ, },
-        { MP_QSTR_write,     MP_ARG_KW_ONLY  | MP_ARG_INT, {.u_int = 0x00} },
+        { MP_QSTR_write,     MP_ARG_INT, {.u_int = 0x00} },
     };
 
     // parse args
@@ -319,7 +319,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_read_obj, 1, pyb_spi_read);
 STATIC mp_obj_t pyb_spi_readinto(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_buf,       MP_ARG_REQUIRED | MP_ARG_OBJ, },
-        { MP_QSTR_write,     MP_ARG_KW_ONLY  | MP_ARG_INT, {.u_int = 0x00} },
+        { MP_QSTR_write,     MP_ARG_INT, {.u_int = 0x00} },
     };
 
     // parse args