vmm: Add tpm parameter

Add an optional --tpm parameter that takes UNIX Domain
Socket from swtpm.

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

vmm/src/lib.rs

@@ -2099,6 +2099,7 @@ mod unit_tests {
             #[cfg(feature = "guest_debug")]
             gdb: false,
             platform: None,
+            tpm: None,
         }))
     }