ipc: move delayed IPC sending to the primary core

Low level IPC processing should be confined to the primary core. Move
delayed IPC sending to a dedicated work queue with core 0 affinity.

Fixes: #8165
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/ipc/ipc-common.c

@@ -179,7 +179,7 @@ static void schedule_ipc_worker(void)
 #ifdef __ZEPHYR__
 	struct ipc *ipc = ipc_get();
 
-	k_work_schedule(&ipc->z_delayed_work, K_USEC(IPC_PERIOD_USEC));
+	sof_primary_wq_reschedule(&ipc->z_delayed_work, K_USEC(IPC_PERIOD_USEC));
 #endif
 }
 
@@ -305,6 +305,8 @@ int ipc_init(struct sof *sof)
 #endif
 
 #ifdef __ZEPHYR__
+	sof_primary_wq_init();
+
 	k_work_init_delayable(&sof->ipc->z_delayed_work, ipc_work_handler);
 #endif