rcu-tasks: Create per-CPU callback lists

Currently, RCU Tasks Trace (as well as the other two flavors of RCU Tasks)
use a single global callback list.  This works well and is simple, but
expected changes in workload will cause this list to become a bottleneck.
This commit therefore creates per-CPU callback lists for the various
flavors of RCU Tasks, but continues queueing on a single list, namely
that of CPU 0.  Later commits will dynamically vary the number of lists
in use to accommodate dynamic changes in workload.

Reported-by: Martin Lau <[email protected]>
Cc: Neeraj Upadhyay <[email protected]>
Tested-by: kernel test robot <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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