clocksource/drivers/bcm_kona: 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/bcm_kona_timer.c

@@ -20,7 +20,6 @@
 #include <linux/clk.h>
 
 #include <linux/io.h>
-#include <asm/mach/time.h>
 
 #include <linux/of.h>
 #include <linux/of_address.h>