mfd: pm8xxx: select IRQ_DOMAIN_HIERARCHY in Kconfig

Select IRQ_DOMAIN_HIERARCHY for pm8xxx in Kconfig since this driver uses
the version 2 IRQ interfaces. IRQ_DOMAIN_HIERARCHY selects IRQ_DOMAIN,
so it can be removed from here.
Signed-off-by: Brian Masney <masneyb@onstation.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/mfd/Kconfig

@@ -927,7 +927,7 @@ config UCB1400_CORE
 config MFD_PM8XXX
 	tristate "Qualcomm PM8xxx PMIC chips driver"
 	depends on (ARM || HEXAGON || COMPILE_TEST)
-	select IRQ_DOMAIN
+	select IRQ_DOMAIN_HIERARCHY
 	select MFD_CORE
 	select REGMAP
 	help