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/pcmcia/electra_cf.c b/drivers/pcmcia/electra_cf.c
index f94d828..546d302 100644
--- a/drivers/pcmcia/electra_cf.c
+++ b/drivers/pcmcia/electra_cf.c
@@ -44,7 +44,7 @@
 	unsigned		present:1;
 	unsigned		active:1;
 
-	struct of_device	*ofdev;
+	struct platform_device	*ofdev;
 	unsigned long		mem_phys;
 	void __iomem *		mem_base;
 	unsigned long		mem_size;
@@ -181,7 +181,7 @@
 	.set_mem_map		= electra_cf_set_mem_map,
 };
 
-static int __devinit electra_cf_probe(struct of_device *ofdev,
+static int __devinit electra_cf_probe(struct platform_device *ofdev,
 				      const struct of_device_id *match)
 {
 	struct device *device = &ofdev->dev;
@@ -325,7 +325,7 @@
 
 }
 
-static int __devexit electra_cf_remove(struct of_device *ofdev)
+static int __devexit electra_cf_remove(struct platform_device *ofdev)
 {
 	struct device *device = &ofdev->dev;
 	struct electra_cf_socket *cf;