GitLab

Trivial compilation fix of iommu.h.
It includes asm/msi.h for struct msi_desc and struct msi_msg
definition.
msi.h doesn't exist yet on ia64 so declare struct msi_desc and
struct msi_msg in iommu.h and don't include asm/msi.h.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>