linux-phytec-ti

iommu/exynos: Refactor init config code

This patch rewrites sysmmu_init_config function to make it easier to read
and understand.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>