Revert "Driver core: convert SPI code to use struct device"

This reverts commit 2943ecf2ed32632473c06f1975db47a7aa98c10f.

This should go through the SPI maintainer, it was my fault that it did
not.  Especially as it conflicts with other patches he has pending.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index 4638e6c..57289b6 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -479,7 +479,7 @@
 	/* this task is the only thing to touch the SPI bits */
 	bitbang->busy = 0;
 	bitbang->workqueue = create_singlethread_workqueue(
-			bitbang->master->dev.parent->bus_id);
+			bitbang->master->cdev.dev->bus_id);
 	if (bitbang->workqueue == NULL) {
 		status = -EBUSY;
 		goto err1;
@@ -513,14 +513,14 @@
 	while (!list_empty(&bitbang->queue) && limit--) {
 		spin_unlock_irq(&bitbang->lock);
 
-		dev_dbg(&bitbang->master->dev, "wait for queue\n");
+		dev_dbg(bitbang->master->cdev.dev, "wait for queue\n");
 		msleep(10);
 
 		spin_lock_irq(&bitbang->lock);
 	}
 	spin_unlock_irq(&bitbang->lock);
 	if (!list_empty(&bitbang->queue)) {
-		dev_err(&bitbang->master->dev, "queue didn't empty\n");
+		dev_err(bitbang->master->cdev.dev, "queue didn't empty\n");
 		return -EBUSY;
 	}