ARM: dts: exynos: Fix interrupt for shared EINTs on Exynos5260

Fix the interrupt information for the GPIO lines with a shared EINT
interrupt.

Fixes: 16d7ff26 ("ARM: dts: add dts files for exynos5260 SoC")
Cc: stable@vger.kernel.org
Signed-off-by: Stuart Menefy <stuart.menefy@mathembedded.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>