stmhal: Enable str.center(), str.[r]partition() and builtin compile().

Also adds "machine" to the list of modules that the parser can search for
constants.

stmhal/mpconfigport.h

@@ -67,10 +67,13 @@
 #define MICROPY_USE_INTERNAL_ERRNO  (1)
 #define MICROPY_PY_FUNCTION_ATTRS   (1)
 #define MICROPY_PY_BUILTINS_STR_UNICODE (1)
+#define MICROPY_PY_BUILTINS_STR_CENTER (1)
+#define MICROPY_PY_BUILTINS_STR_PARTITION (1)
 #define MICROPY_PY_BUILTINS_STR_SPLITLINES (1)
 #define MICROPY_PY_BUILTINS_MEMORYVIEW (1)
 #define MICROPY_PY_BUILTINS_FROZENSET (1)
 #define MICROPY_PY_BUILTINS_EXECFILE (1)
+#define MICROPY_PY_BUILTINS_COMPILE (1)
 #define MICROPY_PY_ALL_SPECIAL_METHODS (1)
 #define MICROPY_PY_MICROPYTHON_MEM_INFO (1)
 #define MICROPY_PY_ARRAY_SLICE_ASSIGN (1)
@@ -177,6 +180,7 @@ extern const struct _mp_obj_module_t mp_module_network;
 // extra constants
 #define MICROPY_PORT_CONSTANTS \
     { MP_OBJ_NEW_QSTR(MP_QSTR_umachine), (mp_obj_t)&machine_module }, \
+    { MP_OBJ_NEW_QSTR(MP_QSTR_machine), (mp_obj_t)&machine_module }, \
     { MP_OBJ_NEW_QSTR(MP_QSTR_pyb), (mp_obj_t)&pyb_module }, \
     { MP_OBJ_NEW_QSTR(MP_QSTR_stm), (mp_obj_t)&stm_module }, \