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/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
index f08cff9..d6e3111 100644
--- a/drivers/net/fs_enet/fs_enet-main.c
+++ b/drivers/net/fs_enet/fs_enet-main.c
@@ -997,7 +997,7 @@
 #endif
 };
 
-static int __devinit fs_enet_probe(struct of_device *ofdev,
+static int __devinit fs_enet_probe(struct platform_device *ofdev,
                                    const struct of_device_id *match)
 {
 	struct net_device *ndev;
@@ -1105,7 +1105,7 @@
 	return ret;
 }
 
-static int fs_enet_remove(struct of_device *ofdev)
+static int fs_enet_remove(struct platform_device *ofdev)
 {
 	struct net_device *ndev = dev_get_drvdata(&ofdev->dev);
 	struct fs_enet_private *fep = netdev_priv(ndev);