PM / Domains: Fix include for PM_GENERIC_DOMAINS=n case

Fix pm_genpd_init() arguments and make sure dev_gpd_data() and
simple_qos_governor exist regardless of CONFIG_PM_GENERIC_DOMAINS
setting.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>