ARM: dts: list the interrupts generated by pin-controller on Exynos5440

Exynos5440 pin-controller generates eight interrupts to support
gpio interrupts. List those interrupt numbers in the pin-controller
node.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>