tests: Enable testing for multi PCI segment for mshv

This test is now supported on MSHV so we can re-enable the support for
it.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>

tests/integration.rs

@@ -2796,7 +2796,6 @@ mod common_parallel {
     }
 
     #[test]
-    #[cfg(not(feature = "mshv"))]
     fn test_pci_multiple_segments() {
         let focal = UbuntuDiskConfig::new(FOCAL_IMAGE_NAME.to_string());
         let guest = Guest::new(Box::new(focal));