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/sbus/char/uctrl.c b/drivers/sbus/char/uctrl.c
index 41eb672..1b345be 100644
--- a/drivers/sbus/char/uctrl.c
+++ b/drivers/sbus/char/uctrl.c
@@ -348,7 +348,7 @@
 	
 }
 
-static int __devinit uctrl_probe(struct of_device *op,
+static int __devinit uctrl_probe(struct platform_device *op,
 				 const struct of_device_id *match)
 {
 	struct uctrl_driver *p;
@@ -404,7 +404,7 @@
 	goto out;
 }
 
-static int __devexit uctrl_remove(struct of_device *op)
+static int __devexit uctrl_remove(struct platform_device *op)
 {
 	struct uctrl_driver *p = dev_get_drvdata(&op->dev);