PM / devfreq: Remove duplicate header file inclusion in exynos5_bus.c

linux/opp.h was included twice.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NMyungJoo Ham <myungjoo.ham@samsung.com>

drivers/devfreq/exynos/exynos5_bus.c

@@ -18,7 +18,6 @@
 #include <linux/opp.h>
 #include <linux/slab.h>
 #include <linux/suspend.h>
-#include <linux/opp.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>