ARM: shmobile: Use domain names when adding subdomains to power domains

Make the power management code under arch/arm/mach-shmobile/
use pm_genpd_add_subdomain_names() for adding subdomains to power
domains, which makes it possible to drop
rmobile_pm_add_subdomain() and will allow us to carry out those
operations for domain objects stored in tables in a straightforward
way.

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

arch/arm/mach-shmobile/pm-rmobile.c

@@ -158,10 +158,4 @@ void rmobile_add_device_to_domain(const char *domain_name,
 	if (pm_clk_no_clocks(dev))
 		pm_clk_add(dev, NULL);
 }
-
-void rmobile_pm_add_subdomain(struct rmobile_pm_domain *rmobile_pd,
-			     struct rmobile_pm_domain *rmobile_sd)
-{
-	pm_genpd_add_subdomain(&rmobile_pd->genpd, &rmobile_sd->genpd);
-}
 #endif /* CONFIG_PM */