cpu: Use already existing usleep_range()

usleep_range() is a wrapper arount usleep_range_state() which hands in
TASK_UNTINTERRUPTIBLE as state argument.

Use already exising wrapper usleep_range(). No functional change.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/all/20240904-devel-anna-maria-b4-timers-flseep-v1-2-e98760256370@linutronix.de