sched,spi: Convert to sched_set_fifo*()

Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

No effective change.

Cc: broonie@kernel.org
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: NIngo Molnar <mingo@kernel.org>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
Reviewed-by: NGuenter Roeck <groeck@chromium.org>

drivers/platform/chrome/cros_ec_spi.c

@@ -709,9 +709,6 @@ static void cros_ec_spi_high_pri_release(void *worker)
 static int cros_ec_spi_devm_high_pri_alloc(struct device *dev,
 					   struct cros_ec_spi *ec_spi)
 {
-	struct sched_param sched_priority = {
-		.sched_priority = MAX_RT_PRIO / 2,
-	};
 	int err;
 
 	ec_spi->high_pri_worker =
@@ -728,8 +725,7 @@ static int cros_ec_spi_devm_high_pri_alloc(struct device *dev,
 	if (err)
 		return err;
 
-	err = sched_setscheduler_nocheck(ec_spi->high_pri_worker->task,
-					 SCHED_FIFO, &sched_priority);
+	err = sched_set_fifo(ec_spi->high_pri_worker->task);
 	if (err)
 		dev_err(dev, "Can't set cros_ec high pri priority: %d\n", err);
 	return err;

drivers/spi/spi.c

@@ -1592,11 +1592,9 @@ EXPORT_SYMBOL_GPL(spi_take_timestamp_post);
  */
 static void spi_set_thread_rt(struct spi_controller *ctlr)
 {
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
-
 	dev_info(&ctlr->dev,
 		"will run message pump with realtime priority\n");
-	sched_setscheduler(ctlr->kworker_task, SCHED_FIFO, &param);
+	sched_set_fifo(ctlr->kworker_task);
 }
 
 static int spi_init_queue(struct spi_controller *ctlr)