ARM: S5PV210: Add support for GPIO Interrupt

S5PV210/S5PC110 can use common S5P GPIO interrupt code.
This patch adds required defines and code to make use of it.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[kgene.kim@samsung.com: minor title fixes]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>