ARM: dts: add iommu property to JPEG device for exynos4

JPEG codec node has been added in parallel to the patch, which
added support for IOMMU to Exynos platform, so JPEG device for
Exynos4 SoCs lacked IOMMU property. This patch fixes this issue.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>