LL: add NOTIFIER_ID_LL_PRE_RUN to scheduler

Recalculation of DP tasks states - readiness and deadlines -
need to be called every time situation may change, that includes:
 - start of LL processing
 - end of LL processing
 - end of processing of any DP module

this commit adds NOTIFIER_ID_LL_PRE_RUN to allow pre-ll call
to DP scheduler

Signed-off-by: Marcin Szkudlinski <marcin.szkudlinski@intel.com>

Author: marcinszkudlinski

src/include/sof/lib/notifier.h

@@ -32,6 +32,7 @@ enum notify_id {
 	NOTIFIER_ID_BUFFER_FREE,		/* struct buffer_cb_free* */
 	NOTIFIER_ID_DMA_COPY,			/* struct dma_cb_data* */
 	NOTIFIER_ID_LL_POST_RUN,		/* NULL */
+	NOTIFIER_ID_LL_PRE_RUN,			/* NULL */
 	NOTIFIER_ID_DMA_IRQ,			/* struct dma_chan_data * */
 	NOTIFIER_ID_DAI_TRIGGER,		/* struct dai_group * */
 	NOTIFIER_ID_MIC_PRIVACY_STATE_CHANGE,	/* struct mic_privacy_settings * */

src/schedule/ll_schedule.c

@@ -313,6 +313,9 @@ static void schedule_ll_tasks_run(void *data)
 
 	perf_cnt_init(&sch->pcd);
 
+	notifier_event(sch, NOTIFIER_ID_LL_PRE_RUN,
+		       NOTIFIER_TARGET_CORE_LOCAL, NULL, 0);
+
 	/* run tasks if there are any pending */
 	if (schedule_ll_is_pending(sch))
 		schedule_ll_tasks_execute(sch);

src/schedule/zephyr_ll.c

@@ -176,6 +176,9 @@ static void zephyr_ll_run(void *data)
 	struct list_item *list, *tmp, task_head = LIST_INIT(task_head);
 	uint32_t flags;
 
+	notifier_event(sch, NOTIFIER_ID_LL_PRE_RUN,
+		       NOTIFIER_TARGET_CORE_LOCAL, NULL, 0);
+
 	zephyr_ll_lock(sch, &flags);
 
 	/*