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/alpha/kernel/time.c

@@ -133,7 +133,7 @@ init_rtc_clockevent(void)
  * The QEMU clock as a clocksource primitive.
  */
 
-static cycle_t
+static u64
 qemu_cs_read(struct clocksource *cs)
 {
 	return qemu_get_vmtime();
@@ -260,7 +260,7 @@ common_init_rtc(void)
  * use this method when WTINT is in use.
  */
 
-static cycle_t read_rpcc(struct clocksource *cs)
+static u64 read_rpcc(struct clocksource *cs)
 {
 	return rpcc();
 }