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/char/hw_random/pasemi-rng.c

@@ -94,7 +94,7 @@ static struct hwrng pasemi_rng = {
 	.data_read	= pasemi_rng_data_read,
 };
 
-static int __devinit rng_probe(struct of_device *ofdev,
+static int __devinit rng_probe(struct platform_device *ofdev,
 			       const struct of_device_id *match)
 {
 	void __iomem *rng_regs;
@@ -123,7 +123,7 @@ static int __devinit rng_probe(struct of_device *ofdev,
 	return err;
 }
 
-static int __devexit rng_remove(struct of_device *dev)
+static int __devexit rng_remove(struct platform_device *dev)
 {
 	void __iomem *rng_regs = (void __iomem *)pasemi_rng.priv;