x86/PCI: VMD: Set bus resource start to 0

The bus always starts at 0.  Due to alignment and down-casting, this
happened to work before, but looked alarmingly incorrect in kernel logs.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

arch/x86/pci/vmd.c

@@ -527,7 +527,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
 	res = &vmd->dev->resource[VMD_CFGBAR];
 	vmd->resources[0] = (struct resource) {
 		.name  = "VMD CFGBAR",
-		.start = res->start,
+		.start = 0,
 		.end   = (resource_size(res) >> 20) - 1,
 		.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
 	};