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/spi/ich.c b/drivers/spi/ich.c
index be4c0a3..b974e84 100644
--- a/drivers/spi/ich.c
+++ b/drivers/spi/ich.c
@@ -740,7 +740,7 @@
 	struct udevice *bus = dev_get_parent(dev);
 	struct ich_spi_platdata *plat = dev_get_platdata(bus);
 	struct ich_spi_priv *priv = dev_get_priv(bus);
-	struct spi_slave *slave = dev_get_parentdata(dev);
+	struct spi_slave *slave = dev_get_parent_priv(dev);
 
 	/*
 	 * Yes this controller can only write a small number of bytes at