dm: rename device struct to udevice

using UBI and DM together leads in compiler error, as
both define a "struct device", so rename "struct device"
in include/dm/device.h to "struct udevice", as we use
linux code (MTD/UBI/UBIFS some USB code,...) and cannot
change the linux "struct device"

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Marek Vasut <marex@denx.de>
diff --git a/drivers/demo/demo-shape.c b/drivers/demo/demo-shape.c
index 2f0eb96..a68cc10 100644
--- a/drivers/demo/demo-shape.c
+++ b/drivers/demo/demo-shape.c
@@ -23,7 +23,7 @@
 };
 
 /* Crazy little function to draw shapes on the console */
-static int shape_hello(struct device *dev, int ch)
+static int shape_hello(struct udevice *dev, int ch)
 {
 	const struct dm_demo_pdata *pdata = dev_get_platdata(dev);
 	struct shape_data *data = dev_get_priv(dev);
@@ -81,7 +81,7 @@
 	return 0;
 }
 
-static int shape_status(struct device *dev, int *status)
+static int shape_status(struct udevice *dev, int *status)
 {
 	struct shape_data *data = dev_get_priv(dev);
 
@@ -94,7 +94,7 @@
 	.status = shape_status,
 };
 
-static int shape_ofdata_to_platdata(struct device *dev)
+static int shape_ofdata_to_platdata(struct udevice *dev)
 {
 	struct dm_demo_pdata *pdata = dev_get_platdata(dev);
 	int ret;