esp8266: Enable websocket module.

esp8266/mpconfigport.h

@@ -50,6 +50,7 @@
 #define MICROPY_PY_UZLIB            (1)
 #define MICROPY_PY_LWIP             (1)
 #define MICROPY_PY_MACHINE          (1)
+#define MICROPY_PY_WEBSOCKET        (1)
 #define MICROPY_PY_MICROPYTHON_MEM_INFO (1)
 #define MICROPY_PY_OS_DUPTERM       (1)
 #define MICROPY_CPYTHON_COMPAT      (1)