dm: Rename dev_get_parentdata() to dev_get_parent_priv()

The current name is inconsistent with other driver model data access
functions. Rename it and fix up all users.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/mtd/spi/sf_dataflash.c b/drivers/mtd/spi/sf_dataflash.c
index 3111f4f..b2a56da 100644
--- a/drivers/mtd/spi/sf_dataflash.c
+++ b/drivers/mtd/spi/sf_dataflash.c
@@ -577,7 +577,7 @@
  */
 static int spi_dataflash_probe(struct udevice *dev)
 {
-	struct spi_slave *spi = dev_get_parentdata(dev);
+	struct spi_slave *spi = dev_get_parent_priv(dev);
 	struct spi_flash *spi_flash;
 	struct flash_info *info;
 	u8 idcode[5];