pinctrl: sirf: switch driver to use gpiolib irqchip helpers

This switches the SiRF pinctrl driver over to using the gpiolib
irqchip helpers simplifying some of the code.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index bc7b0c9..934fd89 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -289,6 +289,7 @@
 	bool "CSR SiRFprimaII/SiRFmarco pin controller driver"
 	depends on ARCH_SIRF
 	select PINMUX
+	select GPIOLIB_IRQCHIP
 
 config PINCTRL_SUNXI
 	bool