tracing: Select new NEED_TASKS_RCU Kconfig option

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.
A new NEED_TASKS_RCU Kconfig option has been created to allow this
enablement logic to be in one place in kernel/rcu/Kconfig.

Therefore, select the new NEED_TASKS_RCU Kconfig option instead of the
old TASKS_RCU option.

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

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