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

commit b7ed69d6 upstream.

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

Fixes: 16d7ff26 ("ARM: dts: add dts files for exynos5260 SoC")
Signed-off-by: Stuart Menefy <stuart.menefy@mathembedded.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>