audio: module_adapter: fix non-Zephyr builds

Only use Zephyr heap definitions when building with Zephyr.

Fixes: 9ff0a7a ("alloc: sof_heap: Add missing support for shared buffers in sof_heap_alloc")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/audio/module_adapter/module_adapter.c

@@ -70,8 +70,10 @@ static struct k_heap *module_adapter_dp_heap_new(const struct comp_ipc_config *c
 	void *mod_heap_buf = mod_heap_mem + heap_prefix_size;
 
 	k_heap_init(mod_heap, mod_heap_buf, heap_size - heap_prefix_size);
+#ifdef __ZEPHYR__
 	mod_heap->heap.init_mem = mod_heap_buf;
 	mod_heap->heap.init_bytes = heap_size - heap_prefix_size;
+#endif
 
 	return mod_heap;
 }