ASoC: intel: atom: Remove superfluous flush_scheduled_work()

It seems that flush_scheduled_work() is called without any real
purpose at sst_context_cleanup() (the driver doesn't put works on the
global queue at all).  As the flush_schedule_work() function is going
to be abolished in near future, let's drop it now.

Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220322154826.19400-1-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/atom/sst/sst.c

@@ -360,7 +360,6 @@ void sst_context_cleanup(struct intel_sst_drv *ctx)
 	sst_unregister(ctx->dev);
 	sst_set_fw_state_locked(ctx, SST_SHUTDOWN);
 	sysfs_remove_group(&ctx->dev->kobj, &sst_fw_version_attr_group);
-	flush_scheduled_work();
 	destroy_workqueue(ctx->post_msg_wq);
 	cpu_latency_qos_remove_request(ctx->qos);
 	kfree(ctx->fw_sg_list.src);