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>
diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index 6555821..c0b5df3 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -73,7 +73,7 @@ static inline void pit_write(void __iomem *base, unsigned int reg_offset, unsign
  * Clocksource:  just a monotonic counter of MCK/16 cycles.
  * We don't care whether or not PIT irqs are enabled.
  */
-static cycle_t read_pit_clk(struct clocksource *cs)
+static u64 read_pit_clk(struct clocksource *cs)
 {
 	struct pit_data *data = clksrc_to_pit_data(cs);
 	unsigned long flags;