iommu/exynos: Add missing set_platform_dma_ops callback

Add set_platform_dma_ops() required for proper driver operation on ARM
32bit arch after recent changes in the IOMMU framework (detach ops
removal).

Fixes: c1fe9119 ("iommu: Add set_platform_dma_ops callbacks")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20230123093102.12392-1-m.szyprowski@samsung.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>