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/sbus/char/bbc_envctrl.c b/drivers/sbus/char/bbc_envctrl.c
index 103fdf6..160e751 100644
--- a/drivers/sbus/char/bbc_envctrl.c
+++ b/drivers/sbus/char/bbc_envctrl.c
@@ -443,7 +443,7 @@
 	return 0;
 }
 
-static void attach_one_temp(struct bbc_i2c_bus *bp, struct of_device *op,
+static void attach_one_temp(struct bbc_i2c_bus *bp, struct platform_device *op,
 			    int temp_idx)
 {
 	struct bbc_cpu_temperature *tp;
@@ -488,7 +488,7 @@
 	tp->fan_todo[FAN_CPU] = FAN_SAME;
 }
 
-static void attach_one_fan(struct bbc_i2c_bus *bp, struct of_device *op,
+static void attach_one_fan(struct bbc_i2c_bus *bp, struct platform_device *op,
 			   int fan_idx)
 {
 	struct bbc_fan_control *fp;
@@ -559,7 +559,7 @@
 
 int bbc_envctrl_init(struct bbc_i2c_bus *bp)
 {
-	struct of_device *op;
+	struct platform_device *op;
 	int temp_index = 0;
 	int fan_index = 0;
 	int devidx = 0;