hv: Add suspend/resume callback for vtd

To handle S3 enter/exit for vtd.

Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/include/arch/x86/vtd.h

@@ -229,6 +229,12 @@ void enable_iommu(void);
 /* Disable translation of iommu*/
 void disable_iommu(void);
 
+/* suspend iomu */
+void suspend_iommu(void);
+
+/* resume iomu */
+void resume_iommu(void);
+
 /* iommu initialization */
 int init_iommu(void);
 #endif