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/hexagon/kernel/time.c

@@ -72,9 +72,9 @@ struct adsp_hw_timer_struct {
 /*  Look for "TCX0" for related constants.  */
 static __iomem struct adsp_hw_timer_struct *rtos_timer;
 
-static cycle_t timer_get_cycles(struct clocksource *cs)
+static u64 timer_get_cycles(struct clocksource *cs)
 {
-	return (cycle_t) __vmgettime();
+	return (u64) __vmgettime();
 }
 
 static struct clocksource hexagon_clocksource = {