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>

drivers/sbus/char/bbc_i2c.h

@@ -7,7 +7,7 @@
 
 struct bbc_i2c_client {
 	struct bbc_i2c_bus		*bp;
-	struct of_device		*op;
+	struct platform_device		*op;
 	int				bus;
 	int				address;
 };
@@ -64,16 +64,16 @@ struct bbc_i2c_bus {
 	struct list_head		temps;
 	struct list_head		fans;
 
-	struct of_device		*op;
+	struct platform_device		*op;
 	struct {
-		struct of_device	*device;
+		struct platform_device	*device;
 		int			client_claimed;
 	} devs[NUM_CHILDREN];
 };
 
 /* Probing and attachment. */
-extern struct of_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
-extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct of_device *);
+extern struct platform_device *bbc_i2c_getdev(struct bbc_i2c_bus *, int);
+extern struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct platform_device *);
 extern void bbc_i2c_detach(struct bbc_i2c_client *);
 
 /* Register read/write.  NOTE: Blocking! */