ARM: S3C64XX: Fix interrupt configuration for PCA935x on Cragganmore

0 is a valid IRQ but the interrupt line for the pca935x certainly isn't
connected there which causes it to fail to probe.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>