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/mn10300/kernel/csrc-mn10300.c

@@ -13,7 +13,7 @@
 #include <asm/timex.h>
 #include "internal.h"
 
-static cycle_t mn10300_read(struct clocksource *cs)
+static u64 mn10300_read(struct clocksource *cs)
 {
 	return read_timestamp_counter();
 }