ARM: EXYNOS: fixed SYSMMU setup definition to mate parameter name

This is trivial patch to mate parameter name between iommu api enabled case and
disabled case.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: KyongHo Cho <pullip.cho@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>