x86: Remove dev->archdata.iommu pointer

There are no users left, all drivers have been converted to use the
per-device private pointer offered by IOMMU core.

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

arch/x86/include/asm/device.h

@@ -3,9 +3,6 @@
 #define _ASM_X86_DEVICE_H
 
 struct dev_archdata {
-#ifdef CONFIG_IOMMU_API
-	void *iommu; /* hook for IOMMU specific extension */
-#endif
 };
 
 struct pdev_archdata {