clocksource/drivers/mxs: Remove useless header <asm/mach/time.h>

The driver includes the <asm/mach/time.h> header but it is pointless.

Remove it.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/mxs_timer.c

@@ -31,8 +31,6 @@
 #include <linux/stmp_device.h>
 #include <linux/sched_clock.h>
 
-#include <asm/mach/time.h>
-
 /*
  * There are 2 versions of the timrot on Freescale MXS-based SoCs.
  * The v1 on MX23 only gets 16 bits counter, while v2 on MX28