nohz: Select wide RCU nocb for full dynticks

It makes testing and implementation much easier as we
know in advance that all CPUs are RCU nocbs.

Also this prepares to remove the dynamic check for
nohz_full= boot mask to be a subset of rcu_nocbs=

Eventually this should also help removing the requirement
for the boot CPU to be outside the full dynticks range.

Suggested-by: Christoph Lameter <[email protected]>
Suggested-by: Paul E. McKenney <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Geoff Levand <[email protected]>
Cc: Gilad Ben Yossef <[email protected]>
Cc: Hakan Akkan <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Kevin Hilman <[email protected]>
Cc: Li Zhong <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>

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