drm/exynos: iommu: remove unused entries from exynos_drm_private strcuture

This patch removes unused entries from exynos_drm_private strcuture.
da_start/da_space_size were only used in drm_create_iommu_mapping()
function and never set to other value than the defaults. Instead use
default values directly in arm_iommu_create_mapping() call.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -224,8 +224,6 @@ struct exynos_drm_private {
 	struct drm_property *plane_zpos_property;
 
 	struct device *dma_dev;
-	unsigned long da_start;
-	unsigned long da_space_size;
 	void *mapping;
 
 	unsigned int pipe;

drivers/gpu/drm/exynos/exynos_drm_iommu.c

@@ -48,13 +48,8 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev)
 	struct dma_iommu_mapping *mapping = NULL;
 	struct exynos_drm_private *priv = drm_dev->dev_private;
 
-	if (!priv->da_start)
-		priv->da_start = EXYNOS_DEV_ADDR_START;
-	if (!priv->da_space_size)
-		priv->da_space_size = EXYNOS_DEV_ADDR_SIZE;
-
-	mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start,
-						priv->da_space_size);
+	mapping = arm_iommu_create_mapping(&platform_bus_type,
+			EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE);
 
 	if (IS_ERR(mapping))
 		return PTR_ERR(mapping);