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/openrisc/kernel/time.c

@@ -117,9 +117,9 @@ static __init void openrisc_clockevent_init(void)
  * is 32 bits wide and runs at the CPU clock frequency.
  */
 
-static cycle_t openrisc_timer_read(struct clocksource *cs)
+static u64 openrisc_timer_read(struct clocksource *cs)
 {
-	return (cycle_t) mfspr(SPR_TTCR);
+	return (u64) mfspr(SPR_TTCR);
 }
 
 static struct clocksource openrisc_timer = {