[build] Add vm-cage.h to BUILD.gn

Bug: chromium:1218005
Change-Id: I52368a70c448b8b928fb0cd04a9b7a72f86fafad
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3090973
Auto-Submit: Samuel Groß <saelo@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76266}

BUILD.gn

@@ -2784,6 +2784,7 @@ v8_header_set("v8_internal_headers") {
     "src/init/setup-isolate.h",
     "src/init/startup-data-util.h",
     "src/init/v8.h",
+    "src/init/vm-cage.h",
     "src/interpreter/block-coverage-builder.h",
     "src/interpreter/bytecode-array-builder.h",
     "src/interpreter/bytecode-array-iterator.h",