linux/common-config: SCHED_DEBUG is removed in 6.15 (#395557)

      # Easier debugging of NFS issues.

      SUNRPC_DEBUG = yes;

      # Provide access to tunables like sched_migration_cost_ns

      SCHED_DEBUG = yes;

      SCHED_DEBUG = whenOlder "6.15" yes;

      # Count IRQ and steal CPU time separately

      IRQ_TIME_ACCOUNTING = yes;