clocksource/drivers/exynos_mct: Remove unused header includes

The driver does not use sched.h and platform_device.h.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/exynos_mct.c

@@ -10,14 +10,12 @@
  * published by the Free Software Foundation.
 */
 
-#include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/clockchips.h>
 #include <linux/cpu.h>
-#include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/percpu.h>
 #include <linux/of.h>