sched: Don't make LATENCYTOP select SCHED_DEBUG

SCHED_DEBUG is not in fact required for LATENCYTOP, don't select it.

Suggested-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210412102001.224578981@infradead.org