v8: add ittapi as V8 dependency

Add ittapi to the list of V8 dependencies, which is used by VTune JIT
profiling.

Refs: nodejs/node#39374

Author: fanchenkong1

lib/update-v8/constants.js

@@ -77,5 +77,11 @@ exports.v8Deps = [
     repo: 'third_party/zlib',
     gitignore: zlibIgnore,
     since: 80
+  },
+  {
+    name: 'ittapi',
+    repo: 'third_party/ittapi',
+    gitignore: '!/third_party/ittapi',
+    since: 81
   }
 ];