ARM: OMAP2+: Fix missing select PM_GENERIC_DOMAINS_OF

We should select also PM_GENERIC_DOMAINS_OF in addition to
PM_GENERIC_DOMAINS to have device tree based PM domain providers
enabled.

Fixes: 58cbff02 ("soc: ti: omap-prm: Add basic power domain support")
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Kconfig

@@ -106,6 +106,7 @@ config ARCH_OMAP2PLUS
 	select OMAP_GPMC
 	select PINCTRL
 	select PM_GENERIC_DOMAINS if PM
+	select PM_GENERIC_DOMAINS_OF if PM
 	select RESET_CONTROLLER
 	select SOC_BUS
 	select TI_SYSC