clocksource: timer-imx-gpt: remove include of <asm/mach/time.h>

The include of <asm/mach/time.h> is not needed at all, and causes build
error in some cases.  Remove it.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/timer-imx-gpt.c

@@ -34,8 +34,6 @@
 #include <linux/of_irq.h>
 #include <soc/imx/timer.h>
 
-#include <asm/mach/time.h>
-
 /*
  * There are 4 versions of the timer hardware on Freescale MXC hardware.
  *  - MX1/MXL