powerpc/dma: Remove dev->archdata.iommu_domain

There are no users left, so remove the pointer and save some memory.

Signed-off-by: Joerg Roedel <[email protected]>
Reviewed-by: Jerry Snitselaar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: joergroedel

arch/powerpc/include/asm/device.h

@@ -34,9 +34,6 @@ struct dev_archdata {
 	struct iommu_table	*iommu_table_base;
 #endif
 
-#ifdef CONFIG_IOMMU_API
-	void			*iommu_domain;
-#endif
 #ifdef CONFIG_PPC64
 	struct pci_dn		*pci_data;
 #endif