Input: lm8323 - convert to dev_pm_ops

There is a general move away from bus specific PM operations to using
dev_pm_ops in order to facilicate core improvements. Update lm8323 to
the new model.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>