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/include/dm-demo.h b/include/dm-demo.h
index 6e38d3c..a24fec6 100644
--- a/include/dm-demo.h
+++ b/include/dm-demo.h
@@ -23,14 +23,14 @@
 };
 
 struct demo_ops {
-	int (*hello)(struct device *dev, int ch);
-	int (*status)(struct device *dev, int *status);
+	int (*hello)(struct udevice *dev, int ch);
+	int (*status)(struct udevice *dev, int *status);
 };
 
-int demo_hello(struct device *dev, int ch);
-int demo_status(struct device *dev, int *status);
+int demo_hello(struct udevice *dev, int ch);
+int demo_status(struct udevice *dev, int *status);
 int demo_list(void);
 
-int demo_parse_dt(struct device *dev);
+int demo_parse_dt(struct udevice *dev);
 
 #endif