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/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index ecb51b3..67c4534 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -712,7 +712,7 @@
 	.attrs = ehca_dev_attrs
 };
 
-static int __devinit ehca_probe(struct of_device *dev,
+static int __devinit ehca_probe(struct platform_device *dev,
 				const struct of_device_id *id)
 {
 	struct ehca_shca *shca;
@@ -878,7 +878,7 @@
 	return -EINVAL;
 }
 
-static int __devexit ehca_remove(struct of_device *dev)
+static int __devexit ehca_remove(struct platform_device *dev)
 {
 	struct ehca_shca *shca = dev_get_drvdata(&dev->dev);
 	unsigned long flags;