Enable mold linker for non-official arm64 Android builds

Bug: 40208899
Change-Id: Ia030a91c3b55123e0ff3348f7f357852bd7e2aee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7808330
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@google.com>
Commit-Queue: Sam Maier <smaier@google.com>
Cr-Commit-Position: refs/heads/main@{#1626147}
NOKEYCHECK=True
GitOrigin-RevId: 846f170e11d676b9d3977801a2d653de13a8f52e