clocksource: dw_apb: Remove unused header

The time.h header seems not to be used by current code.
Removing this include allows the driver to build on other
architecture that do not have this header.

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jamie Iles <jamie@jamieiles.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Acked-by: NJamie Iles <jamie@jamieiles.com>
Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
[tweaked commit message and header]
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>

drivers/clocksource/dw_apb_timer_of.c

@@ -21,7 +21,6 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 
-#include <asm/mach/time.h>
 #include <asm/sched_clock.h>
 
 static void timer_get_base_and_rate(struct device_node *np,