drivers/base/iommu.c: add missing includes

Fix zillions of -mm x86_64 allmodconfig build errors - the file uses
EXPORT_SYMBOL() and kmalloc but misses the needed includes.

Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Joerg Roedel <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/base/iommu.c

···
 
 #include <linux/bug.h>
 #include <linux/types.h>
+#include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/iommu.h>