embed: Fix arguments to mp_raw_code_load_mem.

Update arguments to mp_raw_code_load_mem so that the embed port can build when MICROPY_PERSISTENT_CODE_LOAD is enabled.

Author: pmendham

ports/embed/port/embed_util.c

@@ -66,7 +66,9 @@ void mp_embed_exec_mpy(const uint8_t *mpy, size_t len) {
  // Execute the given .mpy data.
  mp_module_context_t *ctx = m_new_obj(mp_module_context_t);
  ctx->module.globals = mp_globals_get();
- mp_compiled_module_t cm = mp_raw_code_load_mem(mpy, len, ctx);
+ mp_compiled_module_t cm;
+ cm.context = ctx;
+ mp_raw_code_load_mem(mpy, len, &cm);
  mp_obj_t f = mp_make_function_from_raw_code(cm.rc, ctx, MP_OBJ_NULL);
  mp_call_function_0(f);
  nlr_pop();