It should be V8_TARGET_OS_ANDROID instead of V8_OS_ANDROID.

Bug: chromium:1218005
Change-Id: I4b92977c5d8b70ca5023e30a966508965ea9f0fe
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3706618Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81175}