iommu-api: Add missing header file

If CONFIG_IOMMU_API is not defined some functions will just
return -ENODEV. Add errno.h for the definition of ENODEV.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0a2ba4098996..9940319d6f9d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -19,6 +19,8 @@
 #ifndef __LINUX_IOMMU_H
 #define __LINUX_IOMMU_H
 
+#include <linux/errno.h>
+
 #define IOMMU_READ      (1)
 #define IOMMU_WRITE     (2)
 #define IOMMU_CACHE     (4) /* DMA cache coherency */