rcu: Create NEED_TASKS_RCU to factor out enablement logic

Currently, if a Kconfig option depends on TASKS_RCU, it conditionally does
"select TASKS_RCU if PREEMPTION".  This works, but requires any change in
this enablement logic to be replicated across all such "select" clauses.
This commit therefore creates a new NEED_TASKS_RCU Kconfig option so
that the default value of TASKS_RCU can depend on a combination of this
new option and any needed enablement logic, so that this logic is in
one place.

While in the area, also anticipate a likely future change by adding
PREEMPT_AUTO to that logic.

Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Ankur Arora <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Steven Rostedt <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>

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