arm64: perf: Add cap_user_time_short

	userpg->cap_user_time = 0;

	userpg->cap_user_time_zero = 0;

	userpg->cap_user_time_short = 0;

	do {

		rd = sched_clock_read_begin(&seq);

		userpg->time_mult = rd->mult;

		userpg->time_shift = rd->shift;

		userpg->time_zero = rd->epoch_ns;

		userpg->time_cycles = rd->epoch_cyc;

		userpg->time_mask = rd->sched_clock_mask;

		/*

		 * This isn't strictly correct, the ARM64 counter can be

		 * 'short' and then we get funnies when it wraps. The correct

		 * thing would be to extend the perf ABI with a cycle and mask

		 * value, but because wrapping on ARM64 is very rare in

		 * practise this 'works'.

		 * Subtract the cycle base, such that software that

		 * doesn't know about cap_user_time_short still 'works'

		 * assuming no wraps.

		 */

		ns = mul_u64_u32_shr(rd->epoch_cyc, rd->mult, rd->shift);

		userpg->time_zero -= ns;

	 */

	userpg->cap_user_time = 1;

	userpg->cap_user_time_zero = 1;

	userpg->cap_user_time_short = 1;

}