hv: properly initialize MSI-X table

Though guests are not supposed to read Message Data/Addr, it's still better
off to initialize them to 0.

vector_control should be initialize to zero besides the mask bit.

Tracked-On: #1568
Signed-off-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Li, Fei1 <fei1.li@intel.com>

Author: ZideChen0

hypervisor/dm/vpci/msix.c

@@ -350,7 +350,9 @@ static int vmsix_init(struct pci_vdev *vdev)
 
 	/* Mask all table entries */
 	for (i = 0U; i < msix->table_count; i++) {
-		msix->tables[i].vector_control |= PCIM_MSIX_VCTRL_MASK;
+		msix->tables[i].vector_control = PCIM_MSIX_VCTRL_MASK;
+		msix->tables[i].addr = 0U;
+		msix->tables[i].data = 0U;
 	}
 
 	decode_msix_table_bar(vdev);