ANDROID: rust: Support arrays in target JSON

Some configurations, such as enabled sanitizers, are arrays

This is Android specific because Rust KCFI is incomplete, and we are
using the binder driver as a staging ground to fix it. This patch is
intended to go upstream once the compiler behaves properly.

Signed-off-by: Matthew Maurer <mmaurer@google.com>
Bug: 316623888
Change-Id: I4cf494f36a07a685f6856aef4a361772baedde2e