regmap: change regmap_init_mem() to take ofnode instead udevice

Currently, regmap_init_mem() takes a udevice. This requires the node
has already been associated with a device. It prevents syscon/regmap
from behaving like those in Linux.

Change the first argumenet to take a device node.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index ef0d043..92f0469 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -76,7 +76,7 @@
 {
 	struct meson_reset_priv *priv = dev_get_priv(dev);
 	
-	return regmap_init_mem(dev, &priv->regmap);
+	return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 }
 
 U_BOOT_DRIVER(meson_reset) = {