fix build error in gpio-dwapb patch

fix build error with this message:
kernel/irq/Kconfig:41:error: recursive dependency detected!
kernel/irq/Kconfig:41:  symbol GENERIC_IRQ_CHIP is selected by GPIO_DWAPB
drivers/gpio/Kconfig:131:       symbol GPIO_DWAPB depends on IRQ_DOMAIN
kernel/irq/Kconfig:46:  symbol IRQ_DOMAIN is selected by GENERIC_IRQ_CHIP

Signed-off-by: Alan Tull <atull@altera.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>