[S390] time: remove unused code

#define USECS_PER_JIFFY     ((unsigned long) 1000000/HZ)

#define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)

/*

 * Create a small time difference between the timer interrupts

 * on the different cpus to avoid lock contention.

 */

#define CPU_DEVIATION       (smp_processor_id() << 12)

#define TICK_SIZE tick

u64 sched_clock_base_cc = -1;	/* Force to data section. */

EXPORT_SYMBOL_GPL(sched_clock_base_cc);