[patch] parisc, iommu: add missing include for prefetchw()

[David Rientjes]

prefetchw() requires it to be defined by linux/prefetch.h, or it results
in a compile error:

In file included from drivers/parisc/sba_iommu.c:916:0:
drivers/parisc/iommu-helpers.h: In function 'iommu_fill_pdir':
drivers/parisc/iommu-helpers.h:62:4: error: implicit declaration of function 'prefetchw'

Include linux/prefetch.h.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 drivers/parisc/iommu-helpers.h |    2 ++
 1 files changed, 2 insertions(+)

diff --git a/drivers/parisc/iommu-helpers.h b/drivers/parisc/iommu-helpers.h
--- a/drivers/parisc/iommu-helpers.h
+++ b/drivers/parisc/iommu-helpers.h
@@ -1,3 +1,5 @@
+#include <linux/prefetch.h>
+
 /**
  * iommu_fill_pdir - Insert coalesced scatter/gather chunks into the I/O Pdir.
  * @ioc: The I/O Controller.
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