timers: Remove historical extra jiffie for timeout in msleep()

msleep() and msleep_interruptible() add a jiffie to the requested timeout.

This extra jiffie was introduced to ensure that the timeout will not happen
earlier than specified.

Since the rework of the timer wheel, the enqueue path already takes care of
this. So the extra jiffie added by msleep*() is pointless now.

Remove this extra jiffie in msleep() and msleep_interruptible().

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/all/20240829074133.4547-1-anna-maria@linutronix.de