PM / Domains: Add support for genpd on/off notifiers for specific devicescpuidle_psci_to_driver+genpd_onoff_notify

A device may have specific HW constraints that must be obeyed to, before
its corresponding genpd can be powered off - and vice verse for power on.
However, these constraints can't be managed through the regular runtime PM
based deployment for a device, because the access pattern for it, isn't
solely request based.

For these reasons, let's add dev_pm_genpd_add|remove_notifier(), which
should be called with a device that is already being attached to a genpd,
to add/remove a power on/off notifier for it.

Note that, to further clarify when genpd power on/off notifiers should be
used, we can compare with the existing CPU_CLUSTER_PM_ENTER|EXIT notifiers.
In the long run, the genpd power on/off notifiers should be able to replace
these, even if that also requires additional genpd based platform support
for the current users.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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