Remove the return value of ipSecAddSecurityAssociation

Bug:38350493

Test: runtest -x tests/netd_integration_test.cpp

Change-Id: I48f8462d94e8c4e95d6766c1ce7f24b8a596b743
diff --git a/server/NetdNativeService.h b/server/NetdNativeService.h
index fbe860c..ad44810 100644
--- a/server/NetdNativeService.h
+++ b/server/NetdNativeService.h
@@ -88,8 +88,7 @@
             int32_t cryptTruncBits,
             int32_t encapType,
             int32_t encapLocalPort,
-            int32_t encapRemotePort,
-            int32_t* allocatedSpi);
+            int32_t encapRemotePort);
 
     binder::Status ipSecDeleteSecurityAssociation(
             int32_t transformId,