sched: drop sched.h dependency on cpumask

sched.h needs cpumask.h mostly for types declaration.  Now that we have
cpumask_types.h, which is a significantly smaller header, we can rely on
it.

The only exception is UP stub for set_cpus_allowed_ptr().  The function
needs to test bit #0 in a @new_mask, which can be trivially opencoded.

Link: https://lkml.kernel.org/r/20240528005648.182376-5-yury.norov@gmail.com
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Cc: Amit Daniel Kachhap <amit.kachhap@gmail.com>
Cc: Anna-Maria Behnsen <anna-maria@linutronix.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Yury Norov <yury.norov@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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