dm: pmic: Convert uclass to livetree

Update the pmic uclass and all pmics to support a live device tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/pmic/sandbox.c b/drivers/power/pmic/sandbox.c
index b4e412e..6763303 100644
--- a/drivers/power/pmic/sandbox.c
+++ b/drivers/power/pmic/sandbox.c
@@ -51,7 +51,7 @@
 
 static int sandbox_pmic_bind(struct udevice *dev)
 {
-	if (!pmic_bind_children(dev, dev_of_offset(dev), pmic_children_info))
+	if (!pmic_bind_children(dev, dev_ofnode(dev), pmic_children_info))
 		error("%s:%d PMIC: %s - no child found!", __func__, __LINE__,
 							  dev->name);