power: supply: remove some duplicated includes

We include of.h twice. It's unnecessary,so
just remove them.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/power_supply_core.c

@@ -156,8 +156,6 @@ static void power_supply_deferred_register_work(struct work_struct *work)
 }
 
 #ifdef CONFIG_OF
-#include <linux/of.h>
-
 static int __power_supply_populate_supplied_from(struct device *dev,
 						 void *data)
 {