mimxrt: Enable built-in help.
#define MICROPY_PY_BUILTINS_FILTER (0)
#define MICROPY_PY_BUILTINS_REVERSED (1)
#define MICROPY_PY_BUILTINS_MIN_MAX (0)
+#define MICROPY_PY_BUILTINS_HELP (1)
#define MICROPY_PY___FILE__ (0)
#define MICROPY_PY_MICROPYTHON_MEM_INFO (1)
#define MICROPY_PY_ARRAY_SLICE_ASSIGN (1)
