codal_port/main: Let sys.path/argv be initialised by mp_init.

When MicroPython was updated to v1.18 in commit
84d9668, frozen modules required ".frozen"
to be in sys.path for the modules to be available to import.  That path is
added by default by mp_init(), so remove the override from mp_main().

Fixes issue #101.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

src/codal_port/main.c

@@ -64,10 +64,6 @@ void mp_main(void) {
         gc_init(heap, heap + sizeof(heap));
         mp_init();
 
-        mp_obj_list_init(MP_OBJ_TO_PTR(mp_sys_path), 0);
-        mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR_));
-        mp_obj_list_init(MP_OBJ_TO_PTR(mp_sys_argv), 0);
-
         if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL) {
             const char *main_py = "main.py";
             if (mp_import_stat(main_py) == MP_IMPORT_STAT_FILE) {