Migrate the Rust system property bindings from bionic.

This mostly just migrates the existing code with a few minor changes
(renaming targets, using // for license comments).

It also adds a toplevel lib.rs and moves the .h file into a subfolder
to make it easier to add more libraries the future.

Bug: 182498247
Test: Build this and dependent libraries.
Change-Id: I3556b11bdd8edd8bd2cd91ce4c841615b27c721b
4 files changed
tree: e08f11b23361f8bc8827c83b655d57df43f1e74a
  1. bindgen/
  2. Android.bp
  3. lib.rs
  4. OWNERS
  5. system_properties.rs