vmm: acpi: Advertise the correct PCI bus range

Since Cloud-Hypervisor currently support one single PCI bus, we must
reflect this through the MCFG table, as it advertises the first bus and
the last bus available. In this case both are bus 0.

This patch saves quite some time during guest kernel boot, as it
prevents from checking each bus for available devices.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/acpi.rs

@@ -180,7 +180,7 @@ pub fn create_acpi_tables(
         base_address: layout::PCI_MMCONFIG_START.0,
         segment: 0,
         start: 0,
-        end: 0xff,
+        end: 0,
         ..Default::default()
     });