gpio: xgene-sb: select IRQ_DOMAIN_HIERARCHY

This driver calls irq_domain_hierarchy() and irq_chip_*_parent().
They are available only when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -504,6 +504,7 @@ config GPIO_XGENE_SB
 	depends on ARCH_XGENE && OF_GPIO
 	select GPIO_GENERIC
 	select GPIOLIB_IRQCHIP
+	select IRQ_DOMAIN_HIERARCHY
 	help
 	  This driver supports the GPIO block within the APM X-Gene
 	  Standby Domain. Say yes here to enable the GPIO functionality.