clocksource: Use a plain u64 instead of cycle_t

There is no point in having an extra type for extra confusion. u64 is
unambiguous.

Conversion was done with the following coccinelle script:

@rem@
@@
-typedef u64 cycle_t;

@fix@
typedef cycle_t;
@@
-cycle_t
+u64

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>

arch/arm/mach-mmp/time.c

@@ -144,7 +144,7 @@ static struct clock_event_device ckevt = {
 	.set_state_oneshot	= timer_set_shutdown,
 };
 
-static cycle_t clksrc_read(struct clocksource *cs)
+static u64 clksrc_read(struct clocksource *cs)
 {
 	return timer_read();
 }