PM / Domains: Call driver's noirq callbacks

Currently genpd installs its own noirq callbacks, but never calls down
to the driver's corresponding callbacks. Add these calls.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>