of/device: Replace struct of_device with struct platform_device

of_device is just an alias for platform_device, so remove it entirely.  Also
replace to_of_device() with to_platform_device() and update comment blocks.

This patch was initially generated from the following semantic patch, and then
edited by hand to pick up the bits that coccinelle didn't catch.

@@
@@
-struct of_device
+struct platform_device

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/serial/of_serial.c b/drivers/serial/of_serial.c
index a48d908..659a695 100644
--- a/drivers/serial/of_serial.c
+++ b/drivers/serial/of_serial.c
@@ -27,7 +27,7 @@
 /*
  * Fill a struct uart_port for a given device node
  */
-static int __devinit of_platform_serial_setup(struct of_device *ofdev,
+static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
 					int type, struct uart_port *port)
 {
 	struct resource resource;
@@ -80,7 +80,7 @@
 /*
  * Try to register a serial port
  */
-static int __devinit of_platform_serial_probe(struct of_device *ofdev,
+static int __devinit of_platform_serial_probe(struct platform_device *ofdev,
 						const struct of_device_id *id)
 {
 	struct of_serial_info *info;
@@ -134,7 +134,7 @@
 /*
  * Release a line
  */
-static int of_platform_serial_remove(struct of_device *ofdev)
+static int of_platform_serial_remove(struct platform_device *ofdev)
 {
 	struct of_serial_info *info = dev_get_drvdata(&ofdev->dev);
 	switch (info->type) {