Add output mark to XfrmController

Adds the ability for XfrmController to set output marks, to allow
support for VTIs. This change uses the underlying networkId field
(renamed from underlyingNetwork), for which the System Server currently
passes the netid of the underlying Network.

Bug: 72392543
Test: All tests (CTS + unit tests) passing
Change-Id: I76fe052ecf0fc193f07713a2ea31a4ad58fc9ff9
diff --git a/server/NetdNativeService.h b/server/NetdNativeService.h
index 5858588..dbf4b6c 100644
--- a/server/NetdNativeService.h
+++ b/server/NetdNativeService.h
@@ -113,7 +113,7 @@
             int32_t mode,
             const std::string& sourceAddress,
             const std::string& destinationAddress,
-            int64_t underlyingNetworkHandle,
+            int32_t underlyingNetId,
             int32_t spi,
             int32_t markValue,
             int32_t markMask,