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/setup-r8a7740.c

@@ -678,7 +678,7 @@ void __init r8a7740_add_standard_devices(void)
 	rmobile_init_pm_domain(&r8a7740_pd_a3sp);
 	rmobile_init_pm_domain(&r8a7740_pd_a4lc);
 
-	rmobile_pm_add_subdomain(&r8a7740_pd_a4s, &r8a7740_pd_a3sp);
+	pm_genpd_add_subdomain_names("A4S", "A3SP");
 
 	/* add devices */
 	platform_add_devices(r8a7740_early_devices,