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 <gregkh@suse.de>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/base/iommu.c b/drivers/base/iommu.c
index 9f0e672..8ad4ffe 100644
--- a/drivers/base/iommu.c
+++ b/drivers/base/iommu.c
@@ -18,6 +18,8 @@
 
 #include <linux/bug.h>
 #include <linux/types.h>
+#include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/iommu.h>