vmm: Introduce landlock cmdline parameter

Users can use this cmdline option to enable/disable Landlock based
sandboxing while running cloud-hypervisor.

Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>

vmm/src/lib.rs

@@ -2189,6 +2189,7 @@ mod unit_tests {
             platform: None,
             tpm: None,
             preserved_fds: None,
+            landlock_enable: false,
         }))
     }