Input: Use pm_sleep_ptr() to avoid need for ifdef CONFIG_PM_SLEEP

As the new pm_sleep_ptr() macro lets the compiler see the code, but
then remove it if !CONFIG_PM_SLEEP it can be used to avoid the need
for #ifdef guards.  Use that in the input core to simplify the code
a little.  Note pm_sleep_ptr() has not been applied to each callback
in the ops structure because the pm_sleep_ptr() at the usage site
is sufficient.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230114171620.42891-15-jic23@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>