IPC4: Helper: Avoid warning about unused in ipc4_get_drv()

This change avoids warning/error:

sof/src/ipc/ipc4/helper.c:945:31: error: unused variable
'sof_uuid' [-Werror,-Wunused-variable]

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

src/ipc/ipc4/helper.c

@@ -942,7 +942,7 @@ int ipc4_process_on_core(uint32_t core, bool blocking)
 
 __cold static const struct comp_driver *ipc4_get_drv(const void *uuid)
 {
-	const struct sof_uuid *const sof_uuid = (const struct sof_uuid *)uuid;
+	const struct sof_uuid *const __maybe_unused sof_uuid = (const struct sof_uuid *)uuid;
 	struct comp_driver_list *drivers = comp_drivers_get();
 	struct list_item *clist;
 	const struct comp_driver *drv = NULL;